drivers/infiniband/core/cma.c

   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/completion.h>
  37 #include <linux/in.h>
  38 #include <linux/in6.h>
  39 #include <linux/mutex.h>
  40 #include <linux/random.h>
  41 #include <linux/idr.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/slab.h>
  44 #include <linux/module.h>
  45 #include <net/route.h>
  46
  47 #include <net/tcp.h>
  48 #include <net/ipv6.h>
  49
  50 #include <rdma/rdma_cm.h>
  51 #include <rdma/rdma_cm_ib.h>
  52 #include <rdma/rdma_netlink.h>
  53 #include <rdma/ib.h>
  54 #include <rdma/ib_cache.h>
  55 #include <rdma/ib_cm.h>
  56 #include <rdma/ib_sa.h>
  57 #include <rdma/iw_cm.h>
  58
  59 MODULE_AUTHOR("Sean Hefty");
  60 MODULE_DESCRIPTION("Generic RDMA CM Agent");
  61 MODULE_LICENSE("Dual BSD/GPL");
  62
  63 #define CMA_CM_RESPONSE_TIMEOUT 20
  64 #define CMA_MAX_CM_RETRIES 15
  65 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  66 #define CMA_IBOE_PACKET_LIFETIME 18
  67
  68 static void cma_add_one(struct ib_device *device);
  69 static void cma_remove_one(struct ib_device *device);
  70
  71 static struct ib_client cma_client = {
  72         .name   = "cma",
  73         .add    = cma_add_one,
  74         .remove = cma_remove_one
  75 };
  76
  77 static struct ib_sa_client sa_client;
  78 static struct rdma_addr_client addr_client;
  79 static LIST_HEAD(dev_list);
  80 static LIST_HEAD(listen_any_list);
  81 static DEFINE_MUTEX(lock);
  82 static struct workqueue_struct *cma_wq;
  83 static DEFINE_IDR(tcp_ps);
  84 static DEFINE_IDR(udp_ps);
  85 static DEFINE_IDR(ipoib_ps);
  86 static DEFINE_IDR(ib_ps);
  87
  88 struct cma_device {
  89         struct list_head        list;
  90         struct ib_device        *device;
  91         struct completion       comp;
  92         atomic_t                refcount;
  93         struct list_head        id_list;
  94 };
  95
  96 struct rdma_bind_list {
  97         struct idr              *ps;
  98         struct hlist_head       owners;
  99         unsigned short          port;
 100 };
 101
 102 enum {
 103         CMA_OPTION_AFONLY,
 104 };
 105
 106 /*
 107  * Device removal can occur at anytime, so we need extra handling to
 108  * serialize notifying the user of device removal with other callbacks.
 109  * We do this by disabling removal notification while a callback is in process,
 110  * and reporting it after the callback completes.
 111  */
 112 struct rdma_id_private {
 113         struct rdma_cm_id       id;
 114
 115         struct rdma_bind_list   *bind_list;
 116         struct hlist_node       node;
 117         struct list_head        list; /* listen_any_list or cma_device.list */
 118         struct list_head        listen_list; /* per device listens */
 119         struct cma_device       *cma_dev;
 120         struct list_head        mc_list;
 121
 122         int                     internal_id;
 123         enum rdma_cm_state      state;
 124         spinlock_t              lock;
 125         struct mutex            qp_mutex;
 126
 127         struct completion       comp;
 128         atomic_t                refcount;
 129         struct mutex            handler_mutex;
 130
 131         int                     backlog;
 132         int                     timeout_ms;
 133         struct ib_sa_query      *query;
 134         int                     query_id;
 135         union {
 136                 struct ib_cm_id *ib;
 137                 struct iw_cm_id *iw;
 138         } cm_id;
 139
 140         u32                     seq_num;
 141         u32                     qkey;
 142         u32                     qp_num;
 143         pid_t                   owner;
 144         u32                     options;
 145         u8                      srq;
 146         u8                      tos;
 147         u8                      reuseaddr;
 148         u8                      afonly;
 149 };
 150
 151 struct cma_multicast {
 152         struct rdma_id_private *id_priv;
 153         union {
 154                 struct ib_sa_multicast *ib;
 155         } multicast;
 156         struct list_head        list;
 157         void                    *context;
 158         struct sockaddr_storage addr;
 159         struct kref             mcref;
 160 };
 161
 162 struct cma_work {
 163         struct work_struct      work;
 164         struct rdma_id_private  *id;
 165         enum rdma_cm_state      old_state;
 166         enum rdma_cm_state      new_state;
 167         struct rdma_cm_event    event;
 168 };
 169
 170 struct cma_ndev_work {
 171         struct work_struct      work;
 172         struct rdma_id_private  *id;
 173         struct rdma_cm_event    event;
 174 };
 175
 176 struct iboe_mcast_work {
 177         struct work_struct       work;
 178         struct rdma_id_private  *id;
 179         struct cma_multicast    *mc;
 180 };
 181
 182 union cma_ip_addr {
 183         struct in6_addr ip6;
 184         struct {
 185                 __be32 pad[3];
 186                 __be32 addr;
 187         } ip4;
 188 };
 189
 190 struct cma_hdr {
 191         u8 cma_version;
 192         u8 ip_version;  /* IP version: 7:4 */
 193         __be16 port;
 194         union cma_ip_addr src_addr;
 195         union cma_ip_addr dst_addr;
 196 };
 197
 198 #define CMA_VERSION 0x00
 199
 200 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 201 {
 202         unsigned long flags;
 203         int ret;
 204
 205         spin_lock_irqsave(&id_priv->lock, flags);
 206         ret = (id_priv->state == comp);
 207         spin_unlock_irqrestore(&id_priv->lock, flags);
 208         return ret;
 209 }
 210
 211 static int cma_comp_exch(struct rdma_id_private *id_priv,
 212                          enum rdma_cm_state comp, enum rdma_cm_state exch)
 213 {
 214         unsigned long flags;
 215         int ret;
 216
 217         spin_lock_irqsave(&id_priv->lock, flags);
 218         if ((ret = (id_priv->state == comp)))
 219                 id_priv->state = exch;
 220         spin_unlock_irqrestore(&id_priv->lock, flags);
 221         return ret;
 222 }
 223
 224 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 225                                    enum rdma_cm_state exch)
 226 {
 227         unsigned long flags;
 228         enum rdma_cm_state old;
 229
 230         spin_lock_irqsave(&id_priv->lock, flags);
 231         old = id_priv->state;
 232         id_priv->state = exch;
 233         spin_unlock_irqrestore(&id_priv->lock, flags);
 234         return old;
 235 }
 236
 237 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
 238 {
 239         return hdr->ip_version >> 4;
 240 }
 241
 242 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 243 {
 244         hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 245 }
 246
 247 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 248                               struct cma_device *cma_dev)
 249 {
 250         atomic_inc(&cma_dev->refcount);
 251         id_priv->cma_dev = cma_dev;
 252         id_priv->id.device = cma_dev->device;
 253         id_priv->id.route.addr.dev_addr.transport =
 254                 rdma_node_get_transport(cma_dev->device->node_type);
 255         list_add_tail(&id_priv->list, &cma_dev->id_list);
 256 }
 257
 258 static inline void cma_deref_dev(struct cma_device *cma_dev)
 259 {
 260         if (atomic_dec_and_test(&cma_dev->refcount))
 261                 complete(&cma_dev->comp);
 262 }
 263
 264 static inline void release_mc(struct kref *kref)
 265 {
 266         struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 267
 268         kfree(mc->multicast.ib);
 269         kfree(mc);
 270 }
 271
 272 static void cma_release_dev(struct rdma_id_private *id_priv)
 273 {
 274         mutex_lock(&lock);
 275         list_del(&id_priv->list);
 276         cma_deref_dev(id_priv->cma_dev);
 277         id_priv->cma_dev = NULL;
 278         mutex_unlock(&lock);
 279 }
 280
 281 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 282 {
 283         return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
 284 }
 285
 286 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 287 {
 288         return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
 289 }
 290
 291 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 292 {
 293         return id_priv->id.route.addr.src_addr.ss_family;
 294 }
 295
 296 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 297 {
 298         struct ib_sa_mcmember_rec rec;
 299         int ret = 0;
 300
 301         if (id_priv->qkey) {
 302                 if (qkey && id_priv->qkey != qkey)
 303                         return -EINVAL;
 304                 return 0;
 305         }
 306
 307         if (qkey) {
 308                 id_priv->qkey = qkey;
 309                 return 0;
 310         }
 311
 312         switch (id_priv->id.ps) {
 313         case RDMA_PS_UDP:
 314         case RDMA_PS_IB:
 315                 id_priv->qkey = RDMA_UDP_QKEY;
 316                 break;
 317         case RDMA_PS_IPOIB:
 318                 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 319                 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 320                                              id_priv->id.port_num, &rec.mgid,
 321                                              &rec);
 322                 if (!ret)
 323                         id_priv->qkey = be32_to_cpu(rec.qkey);
 324                 break;
 325         default:
 326                 break;
 327         }
 328         return ret;
 329 }
 330
 331 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 332 {
 333         dev_addr->dev_type = ARPHRD_INFINIBAND;
 334         rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
 335         ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
 336 }
 337
 338 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 339 {
 340         int ret;
 341
 342         if (addr->sa_family != AF_IB) {
 343                 ret = rdma_translate_ip(addr, dev_addr, NULL);
 344         } else {
 345                 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
 346                 ret = 0;
 347         }
 348
 349         return ret;
 350 }
 351
 352 static int cma_acquire_dev(struct rdma_id_private *id_priv,
 353                            struct rdma_id_private *listen_id_priv)
 354 {
 355         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 356         struct cma_device *cma_dev;
 357         union ib_gid gid, iboe_gid;
 358         int ret = -ENODEV;
 359         u8 port, found_port;
 360         enum rdma_link_layer dev_ll = dev_addr->dev_type == ARPHRD_INFINIBAND ?
 361                 IB_LINK_LAYER_INFINIBAND : IB_LINK_LAYER_ETHERNET;
 362
 363         if (dev_ll != IB_LINK_LAYER_INFINIBAND &&
 364             id_priv->id.ps == RDMA_PS_IPOIB)
 365                 return -EINVAL;
 366
 367         mutex_lock(&lock);
 368         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 369                     &iboe_gid);
 370
 371         memcpy(&gid, dev_addr->src_dev_addr +
 372                rdma_addr_gid_offset(dev_addr), sizeof gid);
 373         if (listen_id_priv &&
 374             rdma_port_get_link_layer(listen_id_priv->id.device,
 375                                      listen_id_priv->id.port_num) == dev_ll) {
 376                 cma_dev = listen_id_priv->cma_dev;
 377                 port = listen_id_priv->id.port_num;
 378                 if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
 379                     rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
 380                         ret = ib_find_cached_gid(cma_dev->device, &iboe_gid,
 381                                                  &found_port, NULL);
 382                 else
 383                         ret = ib_find_cached_gid(cma_dev->device, &gid,
 384                                                  &found_port, NULL);
 385
 386                 if (!ret && (port  == found_port)) {
 387                         id_priv->id.port_num = found_port;
 388                         goto out;
 389                 }
 390         }
 391         list_for_each_entry(cma_dev, &dev_list, list) {
 392                 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
 393                         if (listen_id_priv &&
 394                             listen_id_priv->cma_dev == cma_dev &&
 395                             listen_id_priv->id.port_num == port)
 396                                 continue;
 397                         if (rdma_port_get_link_layer(cma_dev->device, port) == dev_ll) {
 398                                 if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
 399                                     rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
 400                                         ret = ib_find_cached_gid(cma_dev->device, &iboe_gid, &found_port, NULL);
 401                                 else
 402                                         ret = ib_find_cached_gid(cma_dev->device, &gid, &found_port, NULL);
 403
 404                                 if (!ret && (port == found_port)) {
 405                                         id_priv->id.port_num = found_port;
 406                                         goto out;
 407                                 }
 408                         }
 409                 }
 410         }
 411
 412 out:
 413         if (!ret)
 414                 cma_attach_to_dev(id_priv, cma_dev);
 415
 416         mutex_unlock(&lock);
 417         return ret;
 418 }
 419
 420 /*
 421  * Select the source IB device and address to reach the destination IB address.
 422  */
 423 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 424 {
 425         struct cma_device *cma_dev, *cur_dev;
 426         struct sockaddr_ib *addr;
 427         union ib_gid gid, sgid, *dgid;
 428         u16 pkey, index;
 429         u8 p;
 430         int i;
 431
 432         cma_dev = NULL;
 433         addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
 434         dgid = (union ib_gid *) &addr->sib_addr;
 435         pkey = ntohs(addr->sib_pkey);
 436
 437         list_for_each_entry(cur_dev, &dev_list, list) {
 438                 if (rdma_node_get_transport(cur_dev->device->node_type) != RDMA_TRANSPORT_IB)
 439                         continue;
 440
 441                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
 442                         if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
 443                                 continue;
 444
 445                         for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i, &gid); i++) {
 446                                 if (!memcmp(&gid, dgid, sizeof(gid))) {
 447                                         cma_dev = cur_dev;
 448                                         sgid = gid;
 449                                         id_priv->id.port_num = p;
 450                                         goto found;
 451                                 }
 452
 453                                 if (!cma_dev && (gid.global.subnet_prefix ==
 454                                                  dgid->global.subnet_prefix)) {
 455                                         cma_dev = cur_dev;
 456                                         sgid = gid;
 457                                         id_priv->id.port_num = p;
 458                                 }
 459                         }
 460                 }
 461         }
 462
 463         if (!cma_dev)
 464                 return -ENODEV;
 465
 466 found:
 467         cma_attach_to_dev(id_priv, cma_dev);
 468         addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
 469         memcpy(&addr->sib_addr, &sgid, sizeof sgid);
 470         cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
 471         return 0;
 472 }
 473
 474 static void cma_deref_id(struct rdma_id_private *id_priv)
 475 {
 476         if (atomic_dec_and_test(&id_priv->refcount))
 477                 complete(&id_priv->comp);
 478 }
 479
 480 static int cma_disable_callback(struct rdma_id_private *id_priv,
 481                                 enum rdma_cm_state state)
 482 {
 483         mutex_lock(&id_priv->handler_mutex);
 484         if (id_priv->state != state) {
 485                 mutex_unlock(&id_priv->handler_mutex);
 486                 return -EINVAL;
 487         }
 488         return 0;
 489 }
 490
 491 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 492                                   void *context, enum rdma_port_space ps,
 493                                   enum ib_qp_type qp_type)
 494 {
 495         struct rdma_id_private *id_priv;
 496
 497         id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 498         if (!id_priv)
 499                 return ERR_PTR(-ENOMEM);
 500
 501         id_priv->owner = task_pid_nr(current);
 502         id_priv->state = RDMA_CM_IDLE;
 503         id_priv->id.context = context;
 504         id_priv->id.event_handler = event_handler;
 505         id_priv->id.ps = ps;
 506         id_priv->id.qp_type = qp_type;
 507         spin_lock_init(&id_priv->lock);
 508         mutex_init(&id_priv->qp_mutex);
 509         init_completion(&id_priv->comp);
 510         atomic_set(&id_priv->refcount, 1);
 511         mutex_init(&id_priv->handler_mutex);
 512         INIT_LIST_HEAD(&id_priv->listen_list);
 513         INIT_LIST_HEAD(&id_priv->mc_list);
 514         get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 515
 516         return &id_priv->id;
 517 }
 518 EXPORT_SYMBOL(rdma_create_id);
 519
 520 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 521 {
 522         struct ib_qp_attr qp_attr;
 523         int qp_attr_mask, ret;
 524
 525         qp_attr.qp_state = IB_QPS_INIT;
 526         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 527         if (ret)
 528                 return ret;
 529
 530         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 531         if (ret)
 532                 return ret;
 533
 534         qp_attr.qp_state = IB_QPS_RTR;
 535         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 536         if (ret)
 537                 return ret;
 538
 539         qp_attr.qp_state = IB_QPS_RTS;
 540         qp_attr.sq_psn = 0;
 541         ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 542
 543         return ret;
 544 }
 545
 546 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 547 {
 548         struct ib_qp_attr qp_attr;
 549         int qp_attr_mask, ret;
 550
 551         qp_attr.qp_state = IB_QPS_INIT;
 552         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 553         if (ret)
 554                 return ret;
 555
 556         return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 557 }
 558
 559 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 560                    struct ib_qp_init_attr *qp_init_attr)
 561 {
 562         struct rdma_id_private *id_priv;
 563         struct ib_qp *qp;
 564         int ret;
 565
 566         id_priv = container_of(id, struct rdma_id_private, id);
 567         if (id->device != pd->device)
 568                 return -EINVAL;
 569
 570         qp = ib_create_qp(pd, qp_init_attr);
 571         if (IS_ERR(qp))
 572                 return PTR_ERR(qp);
 573
 574         if (id->qp_type == IB_QPT_UD)
 575                 ret = cma_init_ud_qp(id_priv, qp);
 576         else
 577                 ret = cma_init_conn_qp(id_priv, qp);
 578         if (ret)
 579                 goto err;
 580
 581         id->qp = qp;
 582         id_priv->qp_num = qp->qp_num;
 583         id_priv->srq = (qp->srq != NULL);
 584         return 0;
 585 err:
 586         ib_destroy_qp(qp);
 587         return ret;
 588 }
 589 EXPORT_SYMBOL(rdma_create_qp);
 590
 591 void rdma_destroy_qp(struct rdma_cm_id *id)
 592 {
 593         struct rdma_id_private *id_priv;
 594
 595         id_priv = container_of(id, struct rdma_id_private, id);
 596         mutex_lock(&id_priv->qp_mutex);
 597         ib_destroy_qp(id_priv->id.qp);
 598         id_priv->id.qp = NULL;
 599         mutex_unlock(&id_priv->qp_mutex);
 600 }
 601 EXPORT_SYMBOL(rdma_destroy_qp);
 602
 603 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 604                              struct rdma_conn_param *conn_param)
 605 {
 606         struct ib_qp_attr qp_attr;
 607         int qp_attr_mask, ret;
 608         union ib_gid sgid;
 609
 610         mutex_lock(&id_priv->qp_mutex);
 611         if (!id_priv->id.qp) {
 612                 ret = 0;
 613                 goto out;
 614         }
 615
 616         /* Need to update QP attributes from default values. */
 617         qp_attr.qp_state = IB_QPS_INIT;
 618         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 619         if (ret)
 620                 goto out;
 621
 622         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 623         if (ret)
 624                 goto out;
 625
 626         qp_attr.qp_state = IB_QPS_RTR;
 627         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 628         if (ret)
 629                 goto out;
 630
 631         ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
 632                            qp_attr.ah_attr.grh.sgid_index, &sgid);
 633         if (ret)
 634                 goto out;
 635
 636         if (rdma_node_get_transport(id_priv->cma_dev->device->node_type)
 637             == RDMA_TRANSPORT_IB &&
 638             rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num)
 639             == IB_LINK_LAYER_ETHERNET) {
 640                 ret = rdma_addr_find_smac_by_sgid(&sgid, qp_attr.smac, NULL);
 641
 642                 if (ret)
 643                         goto out;
 644         }
 645         if (conn_param)
 646                 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 647         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 648 out:
 649         mutex_unlock(&id_priv->qp_mutex);
 650         return ret;
 651 }
 652
 653 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 654                              struct rdma_conn_param *conn_param)
 655 {
 656         struct ib_qp_attr qp_attr;
 657         int qp_attr_mask, ret;
 658
 659         mutex_lock(&id_priv->qp_mutex);
 660         if (!id_priv->id.qp) {
 661                 ret = 0;
 662                 goto out;
 663         }
 664
 665         qp_attr.qp_state = IB_QPS_RTS;
 666         ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 667         if (ret)
 668                 goto out;
 669
 670         if (conn_param)
 671                 qp_attr.max_rd_atomic = conn_param->initiator_depth;
 672         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 673 out:
 674         mutex_unlock(&id_priv->qp_mutex);
 675         return ret;
 676 }
 677
 678 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 679 {
 680         struct ib_qp_attr qp_attr;
 681         int ret;
 682
 683         mutex_lock(&id_priv->qp_mutex);
 684         if (!id_priv->id.qp) {
 685                 ret = 0;
 686                 goto out;
 687         }
 688
 689         qp_attr.qp_state = IB_QPS_ERR;
 690         ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 691 out:
 692         mutex_unlock(&id_priv->qp_mutex);
 693         return ret;
 694 }
 695
 696 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 697                                struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 698 {
 699         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 700         int ret;
 701         u16 pkey;
 702
 703         if (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num) ==
 704             IB_LINK_LAYER_INFINIBAND)
 705                 pkey = ib_addr_get_pkey(dev_addr);
 706         else
 707                 pkey = 0xffff;
 708
 709         ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 710                                   pkey, &qp_attr->pkey_index);
 711         if (ret)
 712                 return ret;
 713
 714         qp_attr->port_num = id_priv->id.port_num;
 715         *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 716
 717         if (id_priv->id.qp_type == IB_QPT_UD) {
 718                 ret = cma_set_qkey(id_priv, 0);
 719                 if (ret)
 720                         return ret;
 721
 722                 qp_attr->qkey = id_priv->qkey;
 723                 *qp_attr_mask |= IB_QP_QKEY;
 724         } else {
 725                 qp_attr->qp_access_flags = 0;
 726                 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 727         }
 728         return 0;
 729 }
 730
 731 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 732                        int *qp_attr_mask)
 733 {
 734         struct rdma_id_private *id_priv;
 735         int ret = 0;
 736
 737         id_priv = container_of(id, struct rdma_id_private, id);
 738         switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 739         case RDMA_TRANSPORT_IB:
 740                 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
 741                         ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 742                 else
 743                         ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 744                                                  qp_attr_mask);
 745
 746                 if (qp_attr->qp_state == IB_QPS_RTR)
 747                         qp_attr->rq_psn = id_priv->seq_num;
 748                 break;
 749         case RDMA_TRANSPORT_IWARP:
 750                 if (!id_priv->cm_id.iw) {
 751                         qp_attr->qp_access_flags = 0;
 752                         *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 753                 } else
 754                         ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 755                                                  qp_attr_mask);
 756                 break;
 757         default:
 758                 ret = -ENOSYS;
 759                 break;
 760         }
 761
 762         return ret;
 763 }
 764 EXPORT_SYMBOL(rdma_init_qp_attr);
 765
 766 static inline int cma_zero_addr(struct sockaddr *addr)
 767 {
 768         switch (addr->sa_family) {
 769         case AF_INET:
 770                 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
 771         case AF_INET6:
 772                 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
 773         case AF_IB:
 774                 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
 775         default:
 776                 return 0;
 777         }
 778 }
 779
 780 static inline int cma_loopback_addr(struct sockaddr *addr)
 781 {
 782         switch (addr->sa_family) {
 783         case AF_INET:
 784                 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
 785         case AF_INET6:
 786                 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
 787         case AF_IB:
 788                 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
 789         default:
 790                 return 0;
 791         }
 792 }
 793
 794 static inline int cma_any_addr(struct sockaddr *addr)
 795 {
 796         return cma_zero_addr(addr) || cma_loopback_addr(addr);
 797 }
 798
 799 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
 800 {
 801         if (src->sa_family != dst->sa_family)
 802                 return -1;
 803
 804         switch (src->sa_family) {
 805         case AF_INET:
 806                 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
 807                        ((struct sockaddr_in *) dst)->sin_addr.s_addr;
 808         case AF_INET6:
 809                 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
 810                                      &((struct sockaddr_in6 *) dst)->sin6_addr);
 811         default:
 812                 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
 813                                    &((struct sockaddr_ib *) dst)->sib_addr);
 814         }
 815 }
 816
 817 static __be16 cma_port(struct sockaddr *addr)
 818 {
 819         struct sockaddr_ib *sib;
 820
 821         switch (addr->sa_family) {
 822         case AF_INET:
 823                 return ((struct sockaddr_in *) addr)->sin_port;
 824         case AF_INET6:
 825                 return ((struct sockaddr_in6 *) addr)->sin6_port;
 826         case AF_IB:
 827                 sib = (struct sockaddr_ib *) addr;
 828                 return htons((u16) (be64_to_cpu(sib->sib_sid) &
 829                                     be64_to_cpu(sib->sib_sid_mask)));
 830         default:
 831                 return 0;
 832         }
 833 }
 834
 835 static inline int cma_any_port(struct sockaddr *addr)
 836 {
 837         return !cma_port(addr);
 838 }
 839
 840 static void cma_save_ib_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
 841                              struct ib_sa_path_rec *path)
 842 {
 843         struct sockaddr_ib *listen_ib, *ib;
 844
 845         listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
 846         ib = (struct sockaddr_ib *) &id->route.addr.src_addr;
 847         ib->sib_family = listen_ib->sib_family;
 848         ib->sib_pkey = path->pkey;
 849         ib->sib_flowinfo = path->flow_label;
 850         memcpy(&ib->sib_addr, &path->sgid, 16);
 851         ib->sib_sid = listen_ib->sib_sid;
 852         ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
 853         ib->sib_scope_id = listen_ib->sib_scope_id;
 854
 855         ib = (struct sockaddr_ib *) &id->route.addr.dst_addr;
 856         ib->sib_family = listen_ib->sib_family;
 857         ib->sib_pkey = path->pkey;
 858         ib->sib_flowinfo = path->flow_label;
 859         memcpy(&ib->sib_addr, &path->dgid, 16);
 860 }
 861
 862 static void cma_save_ip4_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
 863                               struct cma_hdr *hdr)
 864 {
 865         struct sockaddr_in *listen4, *ip4;
 866
 867         listen4 = (struct sockaddr_in *) &listen_id->route.addr.src_addr;
 868         ip4 = (struct sockaddr_in *) &id->route.addr.src_addr;
 869         ip4->sin_family = listen4->sin_family;
 870         ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
 871         ip4->sin_port = listen4->sin_port;
 872
 873         ip4 = (struct sockaddr_in *) &id->route.addr.dst_addr;
 874         ip4->sin_family = listen4->sin_family;
 875         ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
 876         ip4->sin_port = hdr->port;
 877 }
 878
 879 static void cma_save_ip6_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
 880                               struct cma_hdr *hdr)
 881 {
 882         struct sockaddr_in6 *listen6, *ip6;
 883
 884         listen6 = (struct sockaddr_in6 *) &listen_id->route.addr.src_addr;
 885         ip6 = (struct sockaddr_in6 *) &id->route.addr.src_addr;
 886         ip6->sin6_family = listen6->sin6_family;
 887         ip6->sin6_addr = hdr->dst_addr.ip6;
 888         ip6->sin6_port = listen6->sin6_port;
 889
 890         ip6 = (struct sockaddr_in6 *) &id->route.addr.dst_addr;
 891         ip6->sin6_family = listen6->sin6_family;
 892         ip6->sin6_addr = hdr->src_addr.ip6;
 893         ip6->sin6_port = hdr->port;
 894 }
 895
 896 static int cma_save_net_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
 897                              struct ib_cm_event *ib_event)
 898 {
 899         struct cma_hdr *hdr;
 900
 901         if ((listen_id->route.addr.src_addr.ss_family == AF_IB) &&
 902             (ib_event->event == IB_CM_REQ_RECEIVED)) {
 903                 cma_save_ib_info(id, listen_id, ib_event->param.req_rcvd.primary_path);
 904                 return 0;
 905         }
 906
 907         hdr = ib_event->private_data;
 908         if (hdr->cma_version != CMA_VERSION)
 909                 return -EINVAL;
 910
 911         switch (cma_get_ip_ver(hdr)) {
 912         case 4:
 913                 cma_save_ip4_info(id, listen_id, hdr);
 914                 break;
 915         case 6:
 916                 cma_save_ip6_info(id, listen_id, hdr);
 917                 break;
 918         default:
 919                 return -EINVAL;
 920         }
 921         return 0;
 922 }
 923
 924 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
 925 {
 926         return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
 927 }
 928
 929 static void cma_cancel_route(struct rdma_id_private *id_priv)
 930 {
 931         switch (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num)) {
 932         case IB_LINK_LAYER_INFINIBAND:
 933                 if (id_priv->query)
 934                         ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 935                 break;
 936         default:
 937                 break;
 938         }
 939 }
 940
 941 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 942 {
 943         struct rdma_id_private *dev_id_priv;
 944
 945         /*
 946          * Remove from listen_any_list to prevent added devices from spawning
 947          * additional listen requests.
 948          */
 949         mutex_lock(&lock);
 950         list_del(&id_priv->list);
 951
 952         while (!list_empty(&id_priv->listen_list)) {
 953                 dev_id_priv = list_entry(id_priv->listen_list.next,
 954                                          struct rdma_id_private, listen_list);
 955                 /* sync with device removal to avoid duplicate destruction */
 956                 list_del_init(&dev_id_priv->list);
 957                 list_del(&dev_id_priv->listen_list);
 958                 mutex_unlock(&lock);
 959
 960                 rdma_destroy_id(&dev_id_priv->id);
 961                 mutex_lock(&lock);
 962         }
 963         mutex_unlock(&lock);
 964 }
 965
 966 static void cma_cancel_operation(struct rdma_id_private *id_priv,
 967                                  enum rdma_cm_state state)
 968 {
 969         switch (state) {
 970         case RDMA_CM_ADDR_QUERY:
 971                 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 972                 break;
 973         case RDMA_CM_ROUTE_QUERY:
 974                 cma_cancel_route(id_priv);
 975                 break;
 976         case RDMA_CM_LISTEN:
 977                 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
 978                         cma_cancel_listens(id_priv);
 979                 break;
 980         default:
 981                 break;
 982         }
 983 }
 984
 985 static void cma_release_port(struct rdma_id_private *id_priv)
 986 {
 987         struct rdma_bind_list *bind_list = id_priv->bind_list;
 988
 989         if (!bind_list)
 990                 return;
 991
 992         mutex_lock(&lock);
 993         hlist_del(&id_priv->node);
 994         if (hlist_empty(&bind_list->owners)) {
 995                 idr_remove(bind_list->ps, bind_list->port);
 996                 kfree(bind_list);
 997         }
 998         mutex_unlock(&lock);
 999 }
1000
1001 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1002 {
1003         struct cma_multicast *mc;
1004
1005         while (!list_empty(&id_priv->mc_list)) {
1006                 mc = container_of(id_priv->mc_list.next,
1007                                   struct cma_multicast, list);
1008                 list_del(&mc->list);
1009                 switch (rdma_port_get_link_layer(id_priv->cma_dev->device, id_priv->id.port_num)) {
1010                 case IB_LINK_LAYER_INFINIBAND:
1011                         ib_sa_free_multicast(mc->multicast.ib);
1012                         kfree(mc);
1013                         break;
1014                 case IB_LINK_LAYER_ETHERNET:
1015                         kref_put(&mc->mcref, release_mc);
1016                         break;
1017                 default:
1018                         break;
1019                 }
1020         }
1021 }
1022
1023 void rdma_destroy_id(struct rdma_cm_id *id)
1024 {
1025         struct rdma_id_private *id_priv;
1026         enum rdma_cm_state state;
1027
1028         id_priv = container_of(id, struct rdma_id_private, id);
1029         state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1030         cma_cancel_operation(id_priv, state);
1031
1032         /*
1033          * Wait for any active callback to finish.  New callbacks will find
1034          * the id_priv state set to destroying and abort.
1035          */
1036         mutex_lock(&id_priv->handler_mutex);
1037         mutex_unlock(&id_priv->handler_mutex);
1038
1039         if (id_priv->cma_dev) {
1040                 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
1041                 case RDMA_TRANSPORT_IB:
1042                         if (id_priv->cm_id.ib)
1043                                 ib_destroy_cm_id(id_priv->cm_id.ib);
1044                         break;
1045                 case RDMA_TRANSPORT_IWARP:
1046                         if (id_priv->cm_id.iw)
1047                                 iw_destroy_cm_id(id_priv->cm_id.iw);
1048                         break;
1049                 default:
1050                         break;
1051                 }
1052                 cma_leave_mc_groups(id_priv);
1053                 cma_release_dev(id_priv);
1054         }
1055
1056         cma_release_port(id_priv);
1057         cma_deref_id(id_priv);
1058         wait_for_completion(&id_priv->comp);
1059
1060         if (id_priv->internal_id)
1061                 cma_deref_id(id_priv->id.context);
1062
1063         kfree(id_priv->id.route.path_rec);
1064         kfree(id_priv);
1065 }
1066 EXPORT_SYMBOL(rdma_destroy_id);
1067
1068 static int cma_rep_recv(struct rdma_id_private *id_priv)
1069 {
1070         int ret;
1071
1072         ret = cma_modify_qp_rtr(id_priv, NULL);
1073         if (ret)
1074                 goto reject;
1075
1076         ret = cma_modify_qp_rts(id_priv, NULL);
1077         if (ret)
1078                 goto reject;
1079
1080         ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1081         if (ret)
1082                 goto reject;
1083
1084         return 0;
1085 reject:
1086         cma_modify_qp_err(id_priv);
1087         ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1088                        NULL, 0, NULL, 0);
1089         return ret;
1090 }
1091
1092 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1093                                    struct ib_cm_rep_event_param *rep_data,
1094                                    void *private_data)
1095 {
1096         event->param.conn.private_data = private_data;
1097         event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1098         event->param.conn.responder_resources = rep_data->responder_resources;
1099         event->param.conn.initiator_depth = rep_data->initiator_depth;
1100         event->param.conn.flow_control = rep_data->flow_control;
1101         event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1102         event->param.conn.srq = rep_data->srq;
1103         event->param.conn.qp_num = rep_data->remote_qpn;
1104 }
1105
1106 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1107 {
1108         struct rdma_id_private *id_priv = cm_id->context;
1109         struct rdma_cm_event event;
1110         int ret = 0;
1111
1112         if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1113                 cma_disable_callback(id_priv, RDMA_CM_CONNECT)) ||
1114             (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1115                 cma_disable_callback(id_priv, RDMA_CM_DISCONNECT)))
1116                 return 0;
1117
1118         memset(&event, 0, sizeof event);
1119         switch (ib_event->event) {
1120         case IB_CM_REQ_ERROR:
1121         case IB_CM_REP_ERROR:
1122                 event.event = RDMA_CM_EVENT_UNREACHABLE;
1123                 event.status = -ETIMEDOUT;
1124                 break;
1125         case IB_CM_REP_RECEIVED:
1126                 if (id_priv->id.qp) {
1127                         event.status = cma_rep_recv(id_priv);
1128                         event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1129                                                      RDMA_CM_EVENT_ESTABLISHED;
1130                 } else {
1131                         event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1132                 }
1133                 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1134                                        ib_event->private_data);
1135                 break;
1136         case IB_CM_RTU_RECEIVED:
1137         case IB_CM_USER_ESTABLISHED:
1138                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1139                 break;
1140         case IB_CM_DREQ_ERROR:
1141                 event.status = -ETIMEDOUT; /* fall through */
1142         case IB_CM_DREQ_RECEIVED:
1143         case IB_CM_DREP_RECEIVED:
1144                 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1145                                    RDMA_CM_DISCONNECT))
1146                         goto out;
1147                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1148                 break;
1149         case IB_CM_TIMEWAIT_EXIT:
1150                 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1151                 break;
1152         case IB_CM_MRA_RECEIVED:
1153                 /* ignore event */
1154                 goto out;
1155         case IB_CM_REJ_RECEIVED:
1156                 cma_modify_qp_err(id_priv);
1157                 event.status = ib_event->param.rej_rcvd.reason;
1158                 event.event = RDMA_CM_EVENT_REJECTED;
1159                 event.param.conn.private_data = ib_event->private_data;
1160                 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1161                 break;
1162         default:
1163                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
1164                        ib_event->event);
1165                 goto out;
1166         }
1167
1168         ret = id_priv->id.event_handler(&id_priv->id, &event);
1169         if (ret) {
1170                 /* Destroy the CM ID by returning a non-zero value. */
1171                 id_priv->cm_id.ib = NULL;
1172                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1173                 mutex_unlock(&id_priv->handler_mutex);
1174                 rdma_destroy_id(&id_priv->id);
1175                 return ret;
1176         }
1177 out:
1178         mutex_unlock(&id_priv->handler_mutex);
1179         return ret;
1180 }
1181
1182 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1183                                                struct ib_cm_event *ib_event)
1184 {
1185         struct rdma_id_private *id_priv;
1186         struct rdma_cm_id *id;
1187         struct rdma_route *rt;
1188         int ret;
1189
1190         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1191                             listen_id->ps, ib_event->param.req_rcvd.qp_type);
1192         if (IS_ERR(id))
1193                 return NULL;
1194
1195         id_priv = container_of(id, struct rdma_id_private, id);
1196         if (cma_save_net_info(id, listen_id, ib_event))
1197                 goto err;
1198
1199         rt = &id->route;
1200         rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1201         rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1202                                GFP_KERNEL);
1203         if (!rt->path_rec)
1204                 goto err;
1205
1206         rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1207         if (rt->num_paths == 2)
1208                 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1209
1210         if (cma_any_addr(cma_src_addr(id_priv))) {
1211                 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1212                 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1213                 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1214         } else {
1215                 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1216                 if (ret)
1217                         goto err;
1218         }
1219         rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1220
1221         id_priv->state = RDMA_CM_CONNECT;
1222         return id_priv;
1223
1224 err:
1225         rdma_destroy_id(id);
1226         return NULL;
1227 }
1228
1229 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1230                                               struct ib_cm_event *ib_event)
1231 {
1232         struct rdma_id_private *id_priv;
1233         struct rdma_cm_id *id;
1234         int ret;
1235
1236         id = rdma_create_id(listen_id->event_handler, listen_id->context,
1237                             listen_id->ps, IB_QPT_UD);
1238         if (IS_ERR(id))
1239                 return NULL;
1240
1241         id_priv = container_of(id, struct rdma_id_private, id);
1242         if (cma_save_net_info(id, listen_id, ib_event))
1243                 goto err;
1244
1245         if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
1246                 ret = cma_translate_addr(cma_src_addr(id_priv), &id->route.addr.dev_addr);
1247                 if (ret)
1248                         goto err;
1249         }
1250
1251         id_priv->state = RDMA_CM_CONNECT;
1252         return id_priv;
1253 err:
1254         rdma_destroy_id(id);
1255         return NULL;
1256 }
1257
1258 static void cma_set_req_event_data(struct rdma_cm_event *event,
1259                                    struct ib_cm_req_event_param *req_data,
1260                                    void *private_data, int offset)
1261 {
1262         event->param.conn.private_data = private_data + offset;
1263         event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1264         event->param.conn.responder_resources = req_data->responder_resources;
1265         event->param.conn.initiator_depth = req_data->initiator_depth;
1266         event->param.conn.flow_control = req_data->flow_control;
1267         event->param.conn.retry_count = req_data->retry_count;
1268         event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1269         event->param.conn.srq = req_data->srq;
1270         event->param.conn.qp_num = req_data->remote_qpn;
1271 }
1272
1273 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1274 {
1275         return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1276                  (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1277                 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1278                  (id->qp_type == IB_QPT_UD)) ||
1279                 (!id->qp_type));
1280 }
1281
1282 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1283 {
1284         struct rdma_id_private *listen_id, *conn_id;
1285         struct rdma_cm_event event;
1286         int offset, ret;
1287         u8 smac[ETH_ALEN];
1288         u8 alt_smac[ETH_ALEN];
1289         u8 *psmac = smac;
1290         u8 *palt_smac = alt_smac;
1291         int is_iboe = ((rdma_node_get_transport(cm_id->device->node_type) ==
1292                         RDMA_TRANSPORT_IB) &&
1293                        (rdma_port_get_link_layer(cm_id->device,
1294                         ib_event->param.req_rcvd.port) ==
1295                         IB_LINK_LAYER_ETHERNET));
1296
1297         listen_id = cm_id->context;
1298         if (!cma_check_req_qp_type(&listen_id->id, ib_event))
1299                 return -EINVAL;
1300
1301         if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
1302                 return -ECONNABORTED;
1303
1304         memset(&event, 0, sizeof event);
1305         offset = cma_user_data_offset(listen_id);
1306         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1307         if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1308                 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1309                 event.param.ud.private_data = ib_event->private_data + offset;
1310                 event.param.ud.private_data_len =
1311                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1312         } else {
1313                 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1314                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1315                                        ib_event->private_data, offset);
1316         }
1317         if (!conn_id) {
1318                 ret = -ENOMEM;
1319                 goto err1;
1320         }
1321
1322         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1323         ret = cma_acquire_dev(conn_id, listen_id);
1324         if (ret)
1325                 goto err2;
1326
1327         conn_id->cm_id.ib = cm_id;
1328         cm_id->context = conn_id;
1329         cm_id->cm_handler = cma_ib_handler;
1330
1331         /*
1332          * Protect against the user destroying conn_id from another thread
1333          * until we're done accessing it.
1334          */
1335         atomic_inc(&conn_id->refcount);
1336         ret = conn_id->id.event_handler(&conn_id->id, &event);
1337         if (ret)
1338                 goto err3;
1339
1340         if (is_iboe) {
1341                 if (ib_event->param.req_rcvd.primary_path != NULL)
1342                         rdma_addr_find_smac_by_sgid(
1343                                 &ib_event->param.req_rcvd.primary_path->sgid,
1344                                 psmac, NULL);
1345                 else
1346                         psmac = NULL;
1347                 if (ib_event->param.req_rcvd.alternate_path != NULL)
1348                         rdma_addr_find_smac_by_sgid(
1349                                 &ib_event->param.req_rcvd.alternate_path->sgid,
1350                                 palt_smac, NULL);
1351                 else
1352                         palt_smac = NULL;
1353         }
1354         /*
1355          * Acquire mutex to prevent user executing rdma_destroy_id()
1356          * while we're accessing the cm_id.
1357          */
1358         mutex_lock(&lock);
1359         if (is_iboe)
1360                 ib_update_cm_av(cm_id, psmac, palt_smac);
1361         if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1362             (conn_id->id.qp_type != IB_QPT_UD))
1363                 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1364         mutex_unlock(&lock);
1365         mutex_unlock(&conn_id->handler_mutex);
1366         mutex_unlock(&listen_id->handler_mutex);
1367         cma_deref_id(conn_id);
1368         return 0;
1369
1370 err3:
1371         cma_deref_id(conn_id);
1372         /* Destroy the CM ID by returning a non-zero value. */
1373         conn_id->cm_id.ib = NULL;
1374 err2:
1375         cma_exch(conn_id, RDMA_CM_DESTROYING);
1376         mutex_unlock(&conn_id->handler_mutex);
1377 err1:
1378         mutex_unlock(&listen_id->handler_mutex);
1379         if (conn_id)
1380                 rdma_destroy_id(&conn_id->id);
1381         return ret;
1382 }
1383
1384 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1385 {
1386         if (addr->sa_family == AF_IB)
1387                 return ((struct sockaddr_ib *) addr)->sib_sid;
1388
1389         return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1390 }
1391 EXPORT_SYMBOL(rdma_get_service_id);
1392
1393 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1394                                  struct ib_cm_compare_data *compare)
1395 {
1396         struct cma_hdr *cma_data, *cma_mask;
1397         __be32 ip4_addr;
1398         struct in6_addr ip6_addr;
1399
1400         memset(compare, 0, sizeof *compare);
1401         cma_data = (void *) compare->data;
1402         cma_mask = (void *) compare->mask;
1403
1404         switch (addr->sa_family) {
1405         case AF_INET:
1406                 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1407                 cma_set_ip_ver(cma_data, 4);
1408                 cma_set_ip_ver(cma_mask, 0xF);
1409                 if (!cma_any_addr(addr)) {
1410                         cma_data->dst_addr.ip4.addr = ip4_addr;
1411                         cma_mask->dst_addr.ip4.addr = htonl(~0);
1412                 }
1413                 break;
1414         case AF_INET6:
1415                 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1416                 cma_set_ip_ver(cma_data, 6);
1417                 cma_set_ip_ver(cma_mask, 0xF);
1418                 if (!cma_any_addr(addr)) {
1419                         cma_data->dst_addr.ip6 = ip6_addr;
1420                         memset(&cma_mask->dst_addr.ip6, 0xFF,
1421                                sizeof cma_mask->dst_addr.ip6);
1422                 }
1423                 break;
1424         default:
1425                 break;
1426         }
1427 }
1428
1429 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1430 {
1431         struct rdma_id_private *id_priv = iw_id->context;
1432         struct rdma_cm_event event;
1433         int ret = 0;
1434         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1435         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1436
1437         if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
1438                 return 0;
1439
1440         memset(&event, 0, sizeof event);
1441         switch (iw_event->event) {
1442         case IW_CM_EVENT_CLOSE:
1443                 event.event = RDMA_CM_EVENT_DISCONNECTED;
1444                 break;
1445         case IW_CM_EVENT_CONNECT_REPLY:
1446                 memcpy(cma_src_addr(id_priv), laddr,
1447                        rdma_addr_size(laddr));
1448                 memcpy(cma_dst_addr(id_priv), raddr,
1449                        rdma_addr_size(raddr));
1450                 switch (iw_event->status) {
1451                 case 0:
1452                         event.event = RDMA_CM_EVENT_ESTABLISHED;
1453                         event.param.conn.initiator_depth = iw_event->ird;
1454                         event.param.conn.responder_resources = iw_event->ord;
1455                         break;
1456                 case -ECONNRESET:
1457                 case -ECONNREFUSED:
1458                         event.event = RDMA_CM_EVENT_REJECTED;
1459                         break;
1460                 case -ETIMEDOUT:
1461                         event.event = RDMA_CM_EVENT_UNREACHABLE;
1462                         break;
1463                 default:
1464                         event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1465                         break;
1466                 }
1467                 break;
1468         case IW_CM_EVENT_ESTABLISHED:
1469                 event.event = RDMA_CM_EVENT_ESTABLISHED;
1470                 event.param.conn.initiator_depth = iw_event->ird;
1471                 event.param.conn.responder_resources = iw_event->ord;
1472                 break;
1473         default:
1474                 BUG_ON(1);
1475         }
1476
1477         event.status = iw_event->status;
1478         event.param.conn.private_data = iw_event->private_data;
1479         event.param.conn.private_data_len = iw_event->private_data_len;
1480         ret = id_priv->id.event_handler(&id_priv->id, &event);
1481         if (ret) {
1482                 /* Destroy the CM ID by returning a non-zero value. */
1483                 id_priv->cm_id.iw = NULL;
1484                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1485                 mutex_unlock(&id_priv->handler_mutex);
1486                 rdma_destroy_id(&id_priv->id);
1487                 return ret;
1488         }
1489
1490         mutex_unlock(&id_priv->handler_mutex);
1491         return ret;
1492 }
1493
1494 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1495                                struct iw_cm_event *iw_event)
1496 {
1497         struct rdma_cm_id *new_cm_id;
1498         struct rdma_id_private *listen_id, *conn_id;
1499         struct rdma_cm_event event;
1500         int ret;
1501         struct ib_device_attr attr;
1502         struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1503         struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1504
1505         listen_id = cm_id->context;
1506         if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
1507                 return -ECONNABORTED;
1508
1509         /* Create a new RDMA id for the new IW CM ID */
1510         new_cm_id = rdma_create_id(listen_id->id.event_handler,
1511                                    listen_id->id.context,
1512                                    RDMA_PS_TCP, IB_QPT_RC);
1513         if (IS_ERR(new_cm_id)) {
1514                 ret = -ENOMEM;
1515                 goto out;
1516         }
1517         conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1518         mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1519         conn_id->state = RDMA_CM_CONNECT;
1520
1521         ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
1522         if (ret) {
1523                 mutex_unlock(&conn_id->handler_mutex);
1524                 rdma_destroy_id(new_cm_id);
1525                 goto out;
1526         }
1527
1528         ret = cma_acquire_dev(conn_id, listen_id);
1529         if (ret) {
1530                 mutex_unlock(&conn_id->handler_mutex);
1531                 rdma_destroy_id(new_cm_id);
1532                 goto out;
1533         }
1534
1535         conn_id->cm_id.iw = cm_id;
1536         cm_id->context = conn_id;
1537         cm_id->cm_handler = cma_iw_handler;
1538
1539         memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
1540         memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
1541
1542         ret = ib_query_device(conn_id->id.device, &attr);
1543         if (ret) {
1544                 mutex_unlock(&conn_id->handler_mutex);
1545                 rdma_destroy_id(new_cm_id);
1546                 goto out;
1547         }
1548
1549         memset(&event, 0, sizeof event);
1550         event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1551         event.param.conn.private_data = iw_event->private_data;
1552         event.param.conn.private_data_len = iw_event->private_data_len;
1553         event.param.conn.initiator_depth = iw_event->ird;
1554         event.param.conn.responder_resources = iw_event->ord;
1555
1556         /*
1557          * Protect against the user destroying conn_id from another thread
1558          * until we're done accessing it.
1559          */
1560         atomic_inc(&conn_id->refcount);
1561         ret = conn_id->id.event_handler(&conn_id->id, &event);
1562         if (ret) {
1563                 /* User wants to destroy the CM ID */
1564                 conn_id->cm_id.iw = NULL;
1565                 cma_exch(conn_id, RDMA_CM_DESTROYING);
1566                 mutex_unlock(&conn_id->handler_mutex);
1567                 cma_deref_id(conn_id);
1568                 rdma_destroy_id(&conn_id->id);
1569                 goto out;
1570         }
1571
1572         mutex_unlock(&conn_id->handler_mutex);
1573         cma_deref_id(conn_id);
1574
1575 out:
1576         mutex_unlock(&listen_id->handler_mutex);
1577         return ret;
1578 }
1579
1580 static int cma_ib_listen(struct rdma_id_private *id_priv)
1581 {
1582         struct ib_cm_compare_data compare_data;
1583         struct sockaddr *addr;
1584         struct ib_cm_id *id;
1585         __be64 svc_id;
1586         int ret;
1587
1588         id = ib_create_cm_id(id_priv->id.device, cma_req_handler, id_priv);
1589         if (IS_ERR(id))
1590                 return PTR_ERR(id);
1591
1592         id_priv->cm_id.ib = id;
1593
1594         addr = cma_src_addr(id_priv);
1595         svc_id = rdma_get_service_id(&id_priv->id, addr);
1596         if (cma_any_addr(addr) && !id_priv->afonly)
1597                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1598         else {
1599                 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1600                 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1601         }
1602
1603         if (ret) {
1604                 ib_destroy_cm_id(id_priv->cm_id.ib);
1605                 id_priv->cm_id.ib = NULL;
1606         }
1607
1608         return ret;
1609 }
1610
1611 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1612 {
1613         int ret;
1614         struct iw_cm_id *id;
1615
1616         id = iw_create_cm_id(id_priv->id.device,
1617                              iw_conn_req_handler,
1618                              id_priv);
1619         if (IS_ERR(id))
1620                 return PTR_ERR(id);
1621
1622         id_priv->cm_id.iw = id;
1623
1624         memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
1625                rdma_addr_size(cma_src_addr(id_priv)));
1626
1627         ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1628
1629         if (ret) {
1630                 iw_destroy_cm_id(id_priv->cm_id.iw);
1631                 id_priv->cm_id.iw = NULL;
1632         }
1633
1634         return ret;
1635 }
1636
1637 static int cma_listen_handler(struct rdma_cm_id *id,
1638                               struct rdma_cm_event *event)
1639 {
1640         struct rdma_id_private *id_priv = id->context;
1641
1642         id->context = id_priv->id.context;
1643         id->event_handler = id_priv->id.event_handler;
1644         return id_priv->id.event_handler(id, event);
1645 }
1646
1647 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1648                               struct cma_device *cma_dev)
1649 {
1650         struct rdma_id_private *dev_id_priv;
1651         struct rdma_cm_id *id;
1652         int ret;
1653
1654         if (cma_family(id_priv) == AF_IB &&
1655             rdma_node_get_transport(cma_dev->device->node_type) != RDMA_TRANSPORT_IB)
1656                 return;
1657
1658         id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps,
1659                             id_priv->id.qp_type);
1660         if (IS_ERR(id))
1661                 return;
1662
1663         dev_id_priv = container_of(id, struct rdma_id_private, id);
1664
1665         dev_id_priv->state = RDMA_CM_ADDR_BOUND;
1666         memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
1667                rdma_addr_size(cma_src_addr(id_priv)));
1668
1669         cma_attach_to_dev(dev_id_priv, cma_dev);
1670         list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1671         atomic_inc(&id_priv->refcount);
1672         dev_id_priv->internal_id = 1;
1673         dev_id_priv->afonly = id_priv->afonly;
1674
1675         ret = rdma_listen(id, id_priv->backlog);
1676         if (ret)
1677                 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1678                        "listening on device %s\n", ret, cma_dev->device->name);
1679 }
1680
1681 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1682 {
1683         struct cma_device *cma_dev;
1684
1685         mutex_lock(&lock);
1686         list_add_tail(&id_priv->list, &listen_any_list);
1687         list_for_each_entry(cma_dev, &dev_list, list)
1688                 cma_listen_on_dev(id_priv, cma_dev);
1689         mutex_unlock(&lock);
1690 }
1691
1692 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1693 {
1694         struct rdma_id_private *id_priv;
1695
1696         id_priv = container_of(id, struct rdma_id_private, id);
1697         id_priv->tos = (u8) tos;
1698 }
1699 EXPORT_SYMBOL(rdma_set_service_type);
1700
1701 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1702                               void *context)
1703 {
1704         struct cma_work *work = context;
1705         struct rdma_route *route;
1706
1707         route = &work->id->id.route;
1708
1709         if (!status) {
1710                 route->num_paths = 1;
1711                 *route->path_rec = *path_rec;
1712         } else {
1713                 work->old_state = RDMA_CM_ROUTE_QUERY;
1714                 work->new_state = RDMA_CM_ADDR_RESOLVED;
1715                 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1716                 work->event.status = status;
1717         }
1718
1719         queue_work(cma_wq, &work->work);
1720 }
1721
1722 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1723                               struct cma_work *work)
1724 {
1725         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1726         struct ib_sa_path_rec path_rec;
1727         ib_sa_comp_mask comp_mask;
1728         struct sockaddr_in6 *sin6;
1729         struct sockaddr_ib *sib;
1730
1731         memset(&path_rec, 0, sizeof path_rec);
1732         rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
1733         rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
1734         path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
1735         path_rec.numb_path = 1;
1736         path_rec.reversible = 1;
1737         path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
1738
1739         comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1740                     IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1741                     IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1742
1743         switch (cma_family(id_priv)) {
1744         case AF_INET:
1745                 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1746                 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1747                 break;
1748         case AF_INET6:
1749                 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
1750                 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1751                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1752                 break;
1753         case AF_IB:
1754                 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
1755                 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
1756                 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1757                 break;
1758         }
1759
1760         id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1761                                                id_priv->id.port_num, &path_rec,
1762                                                comp_mask, timeout_ms,
1763                                                GFP_KERNEL, cma_query_handler,
1764                                                work, &id_priv->query);
1765
1766         return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1767 }
1768
1769 static void cma_work_handler(struct work_struct *_work)
1770 {
1771         struct cma_work *work = container_of(_work, struct cma_work, work);
1772         struct rdma_id_private *id_priv = work->id;
1773         int destroy = 0;
1774
1775         mutex_lock(&id_priv->handler_mutex);
1776         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1777                 goto out;
1778
1779         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1780                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1781                 destroy = 1;
1782         }
1783 out:
1784         mutex_unlock(&id_priv->handler_mutex);
1785         cma_deref_id(id_priv);
1786         if (destroy)
1787                 rdma_destroy_id(&id_priv->id);
1788         kfree(work);
1789 }
1790
1791 static void cma_ndev_work_handler(struct work_struct *_work)
1792 {
1793         struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1794         struct rdma_id_private *id_priv = work->id;
1795         int destroy = 0;
1796
1797         mutex_lock(&id_priv->handler_mutex);
1798         if (id_priv->state == RDMA_CM_DESTROYING ||
1799             id_priv->state == RDMA_CM_DEVICE_REMOVAL)
1800                 goto out;
1801
1802         if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1803                 cma_exch(id_priv, RDMA_CM_DESTROYING);
1804                 destroy = 1;
1805         }
1806
1807 out:
1808         mutex_unlock(&id_priv->handler_mutex);
1809         cma_deref_id(id_priv);
1810         if (destroy)
1811                 rdma_destroy_id(&id_priv->id);
1812         kfree(work);
1813 }
1814
1815 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1816 {
1817         struct rdma_route *route = &id_priv->id.route;
1818         struct cma_work *work;
1819         int ret;
1820
1821         work = kzalloc(sizeof *work, GFP_KERNEL);
1822         if (!work)
1823                 return -ENOMEM;
1824
1825         work->id = id_priv;
1826         INIT_WORK(&work->work, cma_work_handler);
1827         work->old_state = RDMA_CM_ROUTE_QUERY;
1828         work->new_state = RDMA_CM_ROUTE_RESOLVED;
1829         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1830
1831         route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1832         if (!route->path_rec) {
1833                 ret = -ENOMEM;
1834                 goto err1;
1835         }
1836
1837         ret = cma_query_ib_route(id_priv, timeout_ms, work);
1838         if (ret)
1839                 goto err2;
1840
1841         return 0;
1842 err2:
1843         kfree(route->path_rec);
1844         route->path_rec = NULL;
1845 err1:
1846         kfree(work);
1847         return ret;
1848 }
1849
1850 int rdma_set_ib_paths(struct rdma_cm_id *id,
1851                       struct ib_sa_path_rec *path_rec, int num_paths)
1852 {
1853         struct rdma_id_private *id_priv;
1854         int ret;
1855
1856         id_priv = container_of(id, struct rdma_id_private, id);
1857         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
1858                            RDMA_CM_ROUTE_RESOLVED))
1859                 return -EINVAL;
1860
1861         id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
1862                                      GFP_KERNEL);
1863         if (!id->route.path_rec) {
1864                 ret = -ENOMEM;
1865                 goto err;
1866         }
1867
1868         id->route.num_paths = num_paths;
1869         return 0;
1870 err:
1871         cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
1872         return ret;
1873 }
1874 EXPORT_SYMBOL(rdma_set_ib_paths);
1875
1876 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1877 {
1878         struct cma_work *work;
1879
1880         work = kzalloc(sizeof *work, GFP_KERNEL);
1881         if (!work)
1882                 return -ENOMEM;
1883
1884         work->id = id_priv;
1885         INIT_WORK(&work->work, cma_work_handler);
1886         work->old_state = RDMA_CM_ROUTE_QUERY;
1887         work->new_state = RDMA_CM_ROUTE_RESOLVED;
1888         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1889         queue_work(cma_wq, &work->work);
1890         return 0;
1891 }
1892
1893 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
1894 {
1895         int prio;
1896         struct net_device *dev;
1897
1898         prio = rt_tos2priority(tos);
1899         dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
1900                 vlan_dev_real_dev(ndev) : ndev;
1901
1902         if (dev->num_tc)
1903                 return netdev_get_prio_tc_map(dev, prio);
1904
1905 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1906         if (ndev->priv_flags & IFF_802_1Q_VLAN)
1907                 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
1908                         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
1909 #endif
1910         return 0;
1911 }
1912
1913 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
1914 {
1915         struct rdma_route *route = &id_priv->id.route;
1916         struct rdma_addr *addr = &route->addr;
1917         struct cma_work *work;
1918         int ret;
1919         struct net_device *ndev = NULL;
1920
1921
1922         work = kzalloc(sizeof *work, GFP_KERNEL);
1923         if (!work)
1924                 return -ENOMEM;
1925
1926         work->id = id_priv;
1927         INIT_WORK(&work->work, cma_work_handler);
1928
1929         route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
1930         if (!route->path_rec) {
1931                 ret = -ENOMEM;
1932                 goto err1;
1933         }
1934
1935         route->num_paths = 1;
1936
1937         if (addr->dev_addr.bound_dev_if)
1938                 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
1939         if (!ndev) {
1940                 ret = -ENODEV;
1941                 goto err2;
1942         }
1943
1944         route->path_rec->vlan_id = rdma_vlan_dev_vlan_id(ndev);
1945         memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
1946         memcpy(route->path_rec->smac, ndev->dev_addr, ndev->addr_len);
1947
1948         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
1949                     &route->path_rec->sgid);
1950         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
1951                     &route->path_rec->dgid);
1952
1953         route->path_rec->hop_limit = 1;
1954         route->path_rec->reversible = 1;
1955         route->path_rec->pkey = cpu_to_be16(0xffff);
1956         route->path_rec->mtu_selector = IB_SA_EQ;
1957         route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
1958         route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
1959         route->path_rec->rate_selector = IB_SA_EQ;
1960         route->path_rec->rate = iboe_get_rate(ndev);
1961         dev_put(ndev);
1962         route->path_rec->packet_life_time_selector = IB_SA_EQ;
1963         route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
1964         if (!route->path_rec->mtu) {
1965                 ret = -EINVAL;
1966                 goto err2;
1967         }
1968
1969         work->old_state = RDMA_CM_ROUTE_QUERY;
1970         work->new_state = RDMA_CM_ROUTE_RESOLVED;
1971         work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1972         work->event.status = 0;
1973
1974         queue_work(cma_wq, &work->work);
1975
1976         return 0;
1977
1978 err2:
1979         kfree(route->path_rec);
1980         route->path_rec = NULL;
1981 err1:
1982         kfree(work);
1983         return ret;
1984 }
1985
1986 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1987 {
1988         struct rdma_id_private *id_priv;
1989         int ret;
1990
1991         id_priv = container_of(id, struct rdma_id_private, id);
1992         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
1993                 return -EINVAL;
1994
1995         atomic_inc(&id_priv->refcount);
1996         switch (rdma_node_get_transport(id->device->node_type)) {
1997         case RDMA_TRANSPORT_IB:
1998                 switch (rdma_port_get_link_layer(id->device, id->port_num)) {
1999                 case IB_LINK_LAYER_INFINIBAND:
2000                         ret = cma_resolve_ib_route(id_priv, timeout_ms);
2001                         break;
2002                 case IB_LINK_LAYER_ETHERNET:
2003                         ret = cma_resolve_iboe_route(id_priv);
2004                         break;
2005                 default:
2006                         ret = -ENOSYS;
2007                 }
2008                 break;
2009         case RDMA_TRANSPORT_IWARP:
2010                 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2011                 break;
2012         default:
2013                 ret = -ENOSYS;
2014                 break;
2015         }
2016         if (ret)
2017                 goto err;
2018
2019         return 0;
2020 err:
2021         cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2022         cma_deref_id(id_priv);
2023         return ret;
2024 }
2025 EXPORT_SYMBOL(rdma_resolve_route);
2026
2027 static void cma_set_loopback(struct sockaddr *addr)
2028 {
2029         switch (addr->sa_family) {
2030         case AF_INET:
2031                 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2032                 break;
2033         case AF_INET6:
2034                 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2035                               0, 0, 0, htonl(1));
2036                 break;
2037         default:
2038                 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2039                             0, 0, 0, htonl(1));
2040                 break;
2041         }
2042 }
2043
2044 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2045 {
2046         struct cma_device *cma_dev, *cur_dev;
2047         struct ib_port_attr port_attr;
2048         union ib_gid gid;
2049         u16 pkey;
2050         int ret;
2051         u8 p;
2052
2053         cma_dev = NULL;
2054         mutex_lock(&lock);
2055         list_for_each_entry(cur_dev, &dev_list, list) {
2056                 if (cma_family(id_priv) == AF_IB &&
2057                     rdma_node_get_transport(cur_dev->device->node_type) != RDMA_TRANSPORT_IB)
2058                         continue;
2059
2060                 if (!cma_dev)
2061                         cma_dev = cur_dev;
2062
2063                 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2064                         if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2065                             port_attr.state == IB_PORT_ACTIVE) {
2066                                 cma_dev = cur_dev;
2067                                 goto port_found;
2068                         }
2069                 }
2070         }
2071
2072         if (!cma_dev) {
2073                 ret = -ENODEV;
2074                 goto out;
2075         }
2076
2077         p = 1;
2078
2079 port_found:
2080         ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
2081         if (ret)
2082                 goto out;
2083
2084         ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2085         if (ret)
2086                 goto out;
2087
2088         id_priv->id.route.addr.dev_addr.dev_type =
2089                 (rdma_port_get_link_layer(cma_dev->device, p) == IB_LINK_LAYER_INFINIBAND) ?
2090                 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2091
2092         rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2093         ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2094         id_priv->id.port_num = p;
2095         cma_attach_to_dev(id_priv, cma_dev);
2096         cma_set_loopback(cma_src_addr(id_priv));
2097 out:
2098         mutex_unlock(&lock);
2099         return ret;
2100 }
2101
2102 static void addr_handler(int status, struct sockaddr *src_addr,
2103                          struct rdma_dev_addr *dev_addr, void *context)
2104 {
2105         struct rdma_id_private *id_priv = context;
2106         struct rdma_cm_event event;
2107
2108         memset(&event, 0, sizeof event);
2109         mutex_lock(&id_priv->handler_mutex);
2110         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2111                            RDMA_CM_ADDR_RESOLVED))
2112                 goto out;
2113
2114         memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2115         if (!status && !id_priv->cma_dev)
2116                 status = cma_acquire_dev(id_priv, NULL);
2117
2118         if (status) {
2119                 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2120                                    RDMA_CM_ADDR_BOUND))
2121                         goto out;
2122                 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2123                 event.status = status;
2124         } else
2125                 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2126
2127         if (id_priv->id.event_handler(&id_priv->id, &event)) {
2128                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2129                 mutex_unlock(&id_priv->handler_mutex);
2130                 cma_deref_id(id_priv);
2131                 rdma_destroy_id(&id_priv->id);
2132                 return;
2133         }
2134 out:
2135         mutex_unlock(&id_priv->handler_mutex);
2136         cma_deref_id(id_priv);
2137 }
2138
2139 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2140 {
2141         struct cma_work *work;
2142         union ib_gid gid;
2143         int ret;
2144
2145         work = kzalloc(sizeof *work, GFP_KERNEL);
2146         if (!work)
2147                 return -ENOMEM;
2148
2149         if (!id_priv->cma_dev) {
2150                 ret = cma_bind_loopback(id_priv);
2151                 if (ret)
2152                         goto err;
2153         }
2154
2155         rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2156         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2157
2158         work->id = id_priv;
2159         INIT_WORK(&work->work, cma_work_handler);
2160         work->old_state = RDMA_CM_ADDR_QUERY;
2161         work->new_state = RDMA_CM_ADDR_RESOLVED;
2162         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2163         queue_work(cma_wq, &work->work);
2164         return 0;
2165 err:
2166         kfree(work);
2167         return ret;
2168 }
2169
2170 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2171 {
2172         struct cma_work *work;
2173         int ret;
2174
2175         work = kzalloc(sizeof *work, GFP_KERNEL);
2176         if (!work)
2177                 return -ENOMEM;
2178
2179         if (!id_priv->cma_dev) {
2180                 ret = cma_resolve_ib_dev(id_priv);
2181                 if (ret)
2182                         goto err;
2183         }
2184
2185         rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2186                 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2187
2188         work->id = id_priv;
2189         INIT_WORK(&work->work, cma_work_handler);
2190         work->old_state = RDMA_CM_ADDR_QUERY;
2191         work->new_state = RDMA_CM_ADDR_RESOLVED;
2192         work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2193         queue_work(cma_wq, &work->work);
2194         return 0;
2195 err:
2196         kfree(work);
2197         return ret;
2198 }
2199
2200 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2201                          struct sockaddr *dst_addr)
2202 {
2203         if (!src_addr || !src_addr->sa_family) {
2204                 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2205                 src_addr->sa_family = dst_addr->sa_family;
2206                 if (dst_addr->sa_family == AF_INET6) {
2207                         ((struct sockaddr_in6 *) src_addr)->sin6_scope_id =
2208                                 ((struct sockaddr_in6 *) dst_addr)->sin6_scope_id;
2209                 } else if (dst_addr->sa_family == AF_IB) {
2210                         ((struct sockaddr_ib *) src_addr)->sib_pkey =
2211                                 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2212                 }
2213         }
2214         return rdma_bind_addr(id, src_addr);
2215 }
2216
2217 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2218                       struct sockaddr *dst_addr, int timeout_ms)
2219 {
2220         struct rdma_id_private *id_priv;
2221         int ret;
2222
2223         id_priv = container_of(id, struct rdma_id_private, id);
2224         if (id_priv->state == RDMA_CM_IDLE) {
2225                 ret = cma_bind_addr(id, src_addr, dst_addr);
2226                 if (ret)
2227                         return ret;
2228         }
2229
2230         if (cma_family(id_priv) != dst_addr->sa_family)
2231                 return -EINVAL;
2232
2233         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2234                 return -EINVAL;
2235
2236         atomic_inc(&id_priv->refcount);
2237         memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2238         if (cma_any_addr(dst_addr)) {
2239                 ret = cma_resolve_loopback(id_priv);
2240         } else {
2241                 if (dst_addr->sa_family == AF_IB) {
2242                         ret = cma_resolve_ib_addr(id_priv);
2243                 } else {
2244                         ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2245                                               dst_addr, &id->route.addr.dev_addr,
2246                                               timeout_ms, addr_handler, id_priv);
2247                 }
2248         }
2249         if (ret)
2250                 goto err;
2251
2252         return 0;
2253 err:
2254         cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2255         cma_deref_id(id_priv);
2256         return ret;
2257 }
2258 EXPORT_SYMBOL(rdma_resolve_addr);
2259
2260 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2261 {
2262         struct rdma_id_private *id_priv;
2263         unsigned long flags;
2264         int ret;
2265
2266         id_priv = container_of(id, struct rdma_id_private, id);
2267         spin_lock_irqsave(&id_priv->lock, flags);
2268         if (reuse || id_priv->state == RDMA_CM_IDLE) {
2269                 id_priv->reuseaddr = reuse;
2270                 ret = 0;
2271         } else {
2272                 ret = -EINVAL;
2273         }
2274         spin_unlock_irqrestore(&id_priv->lock, flags);
2275         return ret;
2276 }
2277 EXPORT_SYMBOL(rdma_set_reuseaddr);
2278
2279 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2280 {
2281         struct rdma_id_private *id_priv;
2282         unsigned long flags;
2283         int ret;
2284
2285         id_priv = container_of(id, struct rdma_id_private, id);
2286         spin_lock_irqsave(&id_priv->lock, flags);
2287         if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2288                 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2289                 id_priv->afonly = afonly;
2290                 ret = 0;
2291         } else {
2292                 ret = -EINVAL;
2293         }
2294         spin_unlock_irqrestore(&id_priv->lock, flags);
2295         return ret;
2296 }
2297 EXPORT_SYMBOL(rdma_set_afonly);
2298
2299 static void cma_bind_port(struct rdma_bind_list *bind_list,
2300                           struct rdma_id_private *id_priv)
2301 {
2302         struct sockaddr *addr;
2303         struct sockaddr_ib *sib;
2304         u64 sid, mask;
2305         __be16 port;
2306
2307         addr = cma_src_addr(id_priv);
2308         port = htons(bind_list->port);
2309
2310         switch (addr->sa_family) {
2311         case AF_INET:
2312                 ((struct sockaddr_in *) addr)->sin_port = port;
2313                 break;
2314         case AF_INET6:
2315                 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2316                 break;
2317         case AF_IB:
2318                 sib = (struct sockaddr_ib *) addr;
2319                 sid = be64_to_cpu(sib->sib_sid);
2320                 mask = be64_to_cpu(sib->sib_sid_mask);
2321                 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2322                 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2323                 break;
2324         }
2325         id_priv->bind_list = bind_list;
2326         hlist_add_head(&id_priv->node, &bind_list->owners);
2327 }
2328
2329 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
2330                           unsigned short snum)
2331 {
2332         struct rdma_bind_list *bind_list;
2333         int ret;
2334
2335         bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2336         if (!bind_list)
2337                 return -ENOMEM;
2338
2339         ret = idr_alloc(ps, bind_list, snum, snum + 1, GFP_KERNEL);
2340         if (ret < 0)
2341                 goto err;
2342
2343         bind_list->ps = ps;
2344         bind_list->port = (unsigned short)ret;
2345         cma_bind_port(bind_list, id_priv);
2346         return 0;
2347 err:
2348         kfree(bind_list);
2349         return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2350 }
2351
2352 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
2353 {
2354         static unsigned int last_used_port;
2355         int low, high, remaining;
2356         unsigned int rover;
2357
2358         inet_get_local_port_range(&init_net, &low, &high);
2359         remaining = (high - low) + 1;
2360         rover = prandom_u32() % remaining + low;
2361 retry:
2362         if (last_used_port != rover &&
2363             !idr_find(ps, (unsigned short) rover)) {
2364                 int ret = cma_alloc_port(ps, id_priv, rover);
2365                 /*
2366                  * Remember previously used port number in order to avoid
2367                  * re-using same port immediately after it is closed.
2368                  */
2369                 if (!ret)
2370                         last_used_port = rover;
2371                 if (ret != -EADDRNOTAVAIL)
2372                         return ret;
2373         }
2374         if (--remaining) {
2375                 rover++;
2376                 if ((rover < low) || (rover > high))
2377                         rover = low;
2378                 goto retry;
2379         }
2380         return -EADDRNOTAVAIL;
2381 }
2382
2383 /*
2384  * Check that the requested port is available.  This is called when trying to
2385  * bind to a specific port, or when trying to listen on a bound port.  In
2386  * the latter case, the provided id_priv may already be on the bind_list, but
2387  * we still need to check that it's okay to start listening.
2388  */
2389 static int cma_check_port(struct rdma_bind_list *bind_list,
2390                           struct rdma_id_private *id_priv, uint8_t reuseaddr)
2391 {
2392         struct rdma_id_private *cur_id;
2393         struct sockaddr *addr, *cur_addr;
2394
2395         addr = cma_src_addr(id_priv);
2396         hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2397                 if (id_priv == cur_id)
2398                         continue;
2399
2400                 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2401                     cur_id->reuseaddr)
2402                         continue;
2403
2404                 cur_addr = cma_src_addr(cur_id);
2405                 if (id_priv->afonly && cur_id->afonly &&
2406                     (addr->sa_family != cur_addr->sa_family))
2407                         continue;
2408
2409                 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2410                         return -EADDRNOTAVAIL;
2411
2412                 if (!cma_addr_cmp(addr, cur_addr))
2413                         return -EADDRINUSE;
2414         }
2415         return 0;
2416 }
2417
2418 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2419 {
2420         struct rdma_bind_list *bind_list;
2421         unsigned short snum;
2422         int ret;
2423
2424         snum = ntohs(cma_port(cma_src_addr(id_priv)));
2425         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2426                 return -EACCES;
2427
2428         bind_list = idr_find(ps, snum);
2429         if (!bind_list) {
2430                 ret = cma_alloc_port(ps, id_priv, snum);
2431         } else {
2432                 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2433                 if (!ret)
2434                         cma_bind_port(bind_list, id_priv);
2435         }
2436         return ret;
2437 }
2438
2439 static int cma_bind_listen(struct rdma_id_private *id_priv)
2440 {
2441         struct rdma_bind_list *bind_list = id_priv->bind_list;
2442         int ret = 0;
2443
2444         mutex_lock(&lock);
2445         if (bind_list->owners.first->next)
2446                 ret = cma_check_port(bind_list, id_priv, 0);
2447         mutex_unlock(&lock);
2448         return ret;
2449 }
2450
2451 static struct idr *cma_select_inet_ps(struct rdma_id_private *id_priv)
2452 {
2453         switch (id_priv->id.ps) {
2454         case RDMA_PS_TCP:
2455                 return &tcp_ps;
2456         case RDMA_PS_UDP:
2457                 return &udp_ps;
2458         case RDMA_PS_IPOIB:
2459                 return &ipoib_ps;
2460         case RDMA_PS_IB:
2461                 return &ib_ps;
2462         default:
2463                 return NULL;
2464         }
2465 }
2466
2467 static struct idr *cma_select_ib_ps(struct rdma_id_private *id_priv)
2468 {
2469         struct idr *ps = NULL;
2470         struct sockaddr_ib *sib;
2471         u64 sid_ps, mask, sid;
2472
2473         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2474         mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
2475         sid = be64_to_cpu(sib->sib_sid) & mask;
2476
2477         if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
2478                 sid_ps = RDMA_IB_IP_PS_IB;
2479                 ps = &ib_ps;
2480         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
2481                    (sid == (RDMA_IB_IP_PS_TCP & mask))) {
2482                 sid_ps = RDMA_IB_IP_PS_TCP;
2483                 ps = &tcp_ps;
2484         } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
2485                    (sid == (RDMA_IB_IP_PS_UDP & mask))) {
2486                 sid_ps = RDMA_IB_IP_PS_UDP;
2487                 ps = &udp_ps;
2488         }
2489
2490         if (ps) {
2491                 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
2492                 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
2493                                                 be64_to_cpu(sib->sib_sid_mask));
2494         }
2495         return ps;
2496 }
2497
2498 static int cma_get_port(struct rdma_id_private *id_priv)
2499 {
2500         struct idr *ps;
2501         int ret;
2502
2503         if (cma_family(id_priv) != AF_IB)
2504                 ps = cma_select_inet_ps(id_priv);
2505         else
2506                 ps = cma_select_ib_ps(id_priv);
2507         if (!ps)
2508                 return -EPROTONOSUPPORT;
2509
2510         mutex_lock(&lock);
2511         if (cma_any_port(cma_src_addr(id_priv)))
2512                 ret = cma_alloc_any_port(ps, id_priv);
2513         else
2514                 ret = cma_use_port(ps, id_priv);
2515         mutex_unlock(&lock);
2516
2517         return ret;
2518 }
2519
2520 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2521                                struct sockaddr *addr)
2522 {
2523 #if IS_ENABLED(CONFIG_IPV6)
2524         struct sockaddr_in6 *sin6;
2525
2526         if (addr->sa_family != AF_INET6)
2527                 return 0;
2528
2529         sin6 = (struct sockaddr_in6 *) addr;
2530
2531         if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
2532                 return 0;
2533
2534         if (!sin6->sin6_scope_id)
2535                         return -EINVAL;
2536
2537         dev_addr->bound_dev_if = sin6->sin6_scope_id;
2538 #endif
2539         return 0;
2540 }
2541
2542 int rdma_listen(struct rdma_cm_id *id, int backlog)
2543 {
2544         struct rdma_id_private *id_priv;
2545         int ret;
2546
2547         id_priv = container_of(id, struct rdma_id_private, id);
2548         if (id_priv->state == RDMA_CM_IDLE) {
2549                 id->route.addr.src_addr.ss_family = AF_INET;
2550                 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
2551                 if (ret)
2552                         return ret;
2553         }
2554
2555         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
2556                 return -EINVAL;
2557
2558         if (id_priv->reuseaddr) {
2559                 ret = cma_bind_listen(id_priv);
2560                 if (ret)
2561                         goto err;
2562         }
2563
2564         id_priv->backlog = backlog;
2565         if (id->device) {
2566                 switch (rdma_node_get_transport(id->device->node_type)) {
2567                 case RDMA_TRANSPORT_IB:
2568                         ret = cma_ib_listen(id_priv);
2569                         if (ret)
2570                                 goto err;
2571                         break;
2572                 case RDMA_TRANSPORT_IWARP:
2573                         ret = cma_iw_listen(id_priv, backlog);
2574                         if (ret)
2575                                 goto err;
2576                         break;
2577                 default:
2578                         ret = -ENOSYS;
2579                         goto err;
2580                 }
2581         } else
2582                 cma_listen_on_all(id_priv);
2583
2584         return 0;
2585 err:
2586         id_priv->backlog = 0;
2587         cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
2588         return ret;
2589 }
2590 EXPORT_SYMBOL(rdma_listen);
2591
2592 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2593 {
2594         struct rdma_id_private *id_priv;
2595         int ret;
2596
2597         if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
2598             addr->sa_family != AF_IB)
2599                 return -EAFNOSUPPORT;
2600
2601         id_priv = container_of(id, struct rdma_id_private, id);
2602         if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
2603                 return -EINVAL;
2604
2605         ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2606         if (ret)
2607                 goto err1;
2608
2609         memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
2610         if (!cma_any_addr(addr)) {
2611                 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
2612                 if (ret)
2613                         goto err1;
2614
2615                 ret = cma_acquire_dev(id_priv, NULL);
2616                 if (ret)
2617                         goto err1;
2618         }
2619
2620         if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
2621                 if (addr->sa_family == AF_INET)
2622                         id_priv->afonly = 1;
2623 #if IS_ENABLED(CONFIG_IPV6)
2624                 else if (addr->sa_family == AF_INET6)
2625                         id_priv->afonly = init_net.ipv6.sysctl.bindv6only;
2626 #endif
2627         }
2628         ret = cma_get_port(id_priv);
2629         if (ret)
2630                 goto err2;
2631
2632         return 0;
2633 err2:
2634         if (id_priv->cma_dev)
2635                 cma_release_dev(id_priv);
2636 err1:
2637         cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
2638         return ret;
2639 }
2640 EXPORT_SYMBOL(rdma_bind_addr);
2641
2642 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
2643 {
2644         struct cma_hdr *cma_hdr;
2645
2646         cma_hdr = hdr;
2647         cma_hdr->cma_version = CMA_VERSION;
2648         if (cma_family(id_priv) == AF_INET) {
2649                 struct sockaddr_in *src4, *dst4;
2650
2651                 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
2652                 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
2653
2654                 cma_set_ip_ver(cma_hdr, 4);
2655                 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2656                 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2657                 cma_hdr->port = src4->sin_port;
2658         } else if (cma_family(id_priv) == AF_INET6) {
2659                 struct sockaddr_in6 *src6, *dst6;
2660
2661                 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2662                 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
2663
2664                 cma_set_ip_ver(cma_hdr, 6);
2665                 cma_hdr->src_addr.ip6 = src6->sin6_addr;
2666                 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2667                 cma_hdr->port = src6->sin6_port;
2668         }
2669         return 0;
2670 }
2671
2672 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2673                                 struct ib_cm_event *ib_event)
2674 {
2675         struct rdma_id_private *id_priv = cm_id->context;
2676         struct rdma_cm_event event;
2677         struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2678         int ret = 0;
2679
2680         if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
2681                 return 0;
2682
2683         memset(&event, 0, sizeof event);
2684         switch (ib_event->event) {
2685         case IB_CM_SIDR_REQ_ERROR:
2686                 event.event = RDMA_CM_EVENT_UNREACHABLE;
2687                 event.status = -ETIMEDOUT;
2688                 break;
2689         case IB_CM_SIDR_REP_RECEIVED:
2690                 event.param.ud.private_data = ib_event->private_data;
2691                 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2692                 if (rep->status != IB_SIDR_SUCCESS) {
2693                         event.event = RDMA_CM_EVENT_UNREACHABLE;
2694                         event.status = ib_event->param.sidr_rep_rcvd.status;
2695                         break;
2696                 }
2697                 ret = cma_set_qkey(id_priv, rep->qkey);
2698                 if (ret) {
2699                         event.event = RDMA_CM_EVENT_ADDR_ERROR;
2700                         event.status = ret;
2701                         break;
2702                 }
2703                 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2704                                      id_priv->id.route.path_rec,
2705                                      &event.param.ud.ah_attr);
2706                 event.param.ud.qp_num = rep->qpn;
2707                 event.param.ud.qkey = rep->qkey;
2708                 event.event = RDMA_CM_EVENT_ESTABLISHED;
2709                 event.status = 0;
2710                 break;
2711         default:
2712                 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2713                        ib_event->event);
2714                 goto out;
2715         }
2716
2717         ret = id_priv->id.event_handler(&id_priv->id, &event);
2718         if (ret) {
2719                 /* Destroy the CM ID by returning a non-zero value. */
2720                 id_priv->cm_id.ib = NULL;
2721                 cma_exch(id_priv, RDMA_CM_DESTROYING);
2722                 mutex_unlock(&id_priv->handler_mutex);
2723                 rdma_destroy_id(&id_priv->id);
2724                 return ret;
2725         }
2726 out:
2727         mutex_unlock(&id_priv->handler_mutex);
2728         return ret;
2729 }
2730
2731 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2732                               struct rdma_conn_param *conn_param)
2733 {
2734         struct ib_cm_sidr_req_param req;
2735         struct ib_cm_id *id;
2736         void *private_data;
2737         int offset, ret;
2738
2739         memset(&req, 0, sizeof req);
2740         offset = cma_user_data_offset(id_priv);
2741         req.private_data_len = offset + conn_param->private_data_len;
2742         if (req.private_data_len < conn_param->private_data_len)
2743                 return -EINVAL;
2744
2745         if (req.private_data_len) {
2746                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2747                 if (!private_data)
2748                         return -ENOMEM;
2749         } else {
2750                 private_data = NULL;
2751         }
2752
2753         if (conn_param->private_data && conn_param->private_data_len)
2754                 memcpy(private_data + offset, conn_param->private_data,
2755                        conn_param->private_data_len);
2756
2757         if (private_data) {
2758                 ret = cma_format_hdr(private_data, id_priv);
2759                 if (ret)
2760                         goto out;
2761                 req.private_data = private_data;
2762         }
2763
2764         id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
2765                              id_priv);
2766         if (IS_ERR(id)) {
2767                 ret = PTR_ERR(id);
2768                 goto out;
2769         }
2770         id_priv->cm_id.ib = id;
2771
2772         req.path = id_priv->id.route.path_rec;
2773         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2774         req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2775         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2776
2777         ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2778         if (ret) {
2779                 ib_destroy_cm_id(id_priv->cm_id.ib);
2780                 id_priv->cm_id.ib = NULL;
2781         }
2782 out:
2783         kfree(private_data);
2784         return ret;
2785 }
2786
2787 static int cma_connect_ib(struct rdma_id_private *id_priv,
2788                           struct rdma_conn_param *conn_param)
2789 {
2790         struct ib_cm_req_param req;
2791         struct rdma_route *route;
2792         void *private_data;
2793         struct ib_cm_id *id;
2794         int offset, ret;
2795
2796         memset(&req, 0, sizeof req);
2797         offset = cma_user_data_offset(id_priv);
2798         req.private_data_len = offset + conn_param->private_data_len;
2799         if (req.private_data_len < conn_param->private_data_len)
2800                 return -EINVAL;
2801
2802         if (req.private_data_len) {
2803                 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2804                 if (!private_data)
2805                         return -ENOMEM;
2806         } else {
2807                 private_data = NULL;
2808         }
2809
2810         if (conn_param->private_data && conn_param->private_data_len)
2811                 memcpy(private_data + offset, conn_param->private_data,
2812                        conn_param->private_data_len);
2813
2814         id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
2815         if (IS_ERR(id)) {
2816                 ret = PTR_ERR(id);
2817                 goto out;
2818         }
2819         id_priv->cm_id.ib = id;
2820
2821         route = &id_priv->id.route;
2822         if (private_data) {
2823                 ret = cma_format_hdr(private_data, id_priv);
2824                 if (ret)
2825                         goto out;
2826                 req.private_data = private_data;
2827         }
2828
2829         req.primary_path = &route->path_rec[0];
2830         if (route->num_paths == 2)
2831                 req.alternate_path = &route->path_rec[1];
2832
2833         req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2834         req.qp_num = id_priv->qp_num;
2835         req.qp_type = id_priv->id.qp_type;
2836         req.starting_psn = id_priv->seq_num;
2837         req.responder_resources = conn_param->responder_resources;
2838         req.initiator_depth = conn_param->initiator_depth;
2839         req.flow_control = conn_param->flow_control;
2840         req.retry_count = min_t(u8, 7, conn_param->retry_count);
2841         req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
2842         req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2843         req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2844         req.max_cm_retries = CMA_MAX_CM_RETRIES;
2845         req.srq = id_priv->srq ? 1 : 0;
2846
2847         ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2848 out:
2849         if (ret && !IS_ERR(id)) {
2850                 ib_destroy_cm_id(id);
2851                 id_priv->cm_id.ib = NULL;
2852         }
2853
2854         kfree(private_data);
2855         return ret;
2856 }
2857
2858 static int cma_connect_iw(struct rdma_id_private *id_priv,
2859                           struct rdma_conn_param *conn_param)
2860 {
2861         struct iw_cm_id *cm_id;
2862         int ret;
2863         struct iw_cm_conn_param iw_param;
2864
2865         cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2866         if (IS_ERR(cm_id))
2867                 return PTR_ERR(cm_id);
2868
2869         id_priv->cm_id.iw = cm_id;
2870
2871         memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
2872                rdma_addr_size(cma_src_addr(id_priv)));
2873         memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
2874                rdma_addr_size(cma_dst_addr(id_priv)));
2875
2876         ret = cma_modify_qp_rtr(id_priv, conn_param);
2877         if (ret)
2878                 goto out;
2879
2880         if (conn_param) {
2881                 iw_param.ord = conn_param->initiator_depth;
2882                 iw_param.ird = conn_param->responder_resources;
2883                 iw_param.private_data = conn_param->private_data;
2884                 iw_param.private_data_len = conn_param->private_data_len;
2885                 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
2886         } else {
2887                 memset(&iw_param, 0, sizeof iw_param);
2888                 iw_param.qpn = id_priv->qp_num;
2889         }
2890         ret = iw_cm_connect(cm_id, &iw_param);
2891 out:
2892         if (ret) {
2893                 iw_destroy_cm_id(cm_id);
2894                 id_priv->cm_id.iw = NULL;
2895         }
2896         return ret;
2897 }
2898
2899 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2900 {
2901         struct rdma_id_private *id_priv;
2902         int ret;
2903
2904         id_priv = container_of(id, struct rdma_id_private, id);
2905         if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
2906                 return -EINVAL;
2907
2908         if (!id->qp) {
2909                 id_priv->qp_num = conn_param->qp_num;
2910                 id_priv->srq = conn_param->srq;
2911         }
2912
2913         switch (rdma_node_get_transport(id->device->node_type)) {
2914         case RDMA_TRANSPORT_IB:
2915                 if (id->qp_type == IB_QPT_UD)
2916                         ret = cma_resolve_ib_udp(id_priv, conn_param);
2917                 else
2918                         ret = cma_connect_ib(id_priv, conn_param);
2919                 break;
2920         case RDMA_TRANSPORT_IWARP:
2921                 ret = cma_connect_iw(id_priv, conn_param);
2922                 break;
2923         default:
2924                 ret = -ENOSYS;
2925                 break;
2926         }
2927         if (ret)
2928                 goto err;
2929
2930         return 0;
2931 err:
2932         cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
2933         return ret;
2934 }
2935 EXPORT_SYMBOL(rdma_connect);
2936
2937 static int cma_accept_ib(struct rdma_id_private *id_priv,
2938                          struct rdma_conn_param *conn_param)
2939 {
2940         struct ib_cm_rep_param rep;
2941         int ret;
2942
2943         ret = cma_modify_qp_rtr(id_priv, conn_param);
2944         if (ret)
2945                 goto out;
2946
2947         ret = cma_modify_qp_rts(id_priv, conn_param);
2948         if (ret)
2949                 goto out;
2950
2951         memset(&rep, 0, sizeof rep);
2952         rep.qp_num = id_priv->qp_num;
2953         rep.starting_psn = id_priv->seq_num;
2954         rep.private_data = conn_param->private_data;
2955         rep.private_data_len = conn_param->private_data_len;
2956         rep.responder_resources = conn_param->responder_resources;
2957         rep.initiator_depth = conn_param->initiator_depth;
2958         rep.failover_accepted = 0;
2959         rep.flow_control = conn_param->flow_control;
2960         rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
2961         rep.srq = id_priv->srq ? 1 : 0;
2962
2963         ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2964 out:
2965         return ret;
2966 }
2967
2968 static int cma_accept_iw(struct rdma_id_private *id_priv,
2969                   struct rdma_conn_param *conn_param)
2970 {
2971         struct iw_cm_conn_param iw_param;
2972         int ret;
2973
2974         ret = cma_modify_qp_rtr(id_priv, conn_param);
2975         if (ret)
2976                 return ret;
2977
2978         iw_param.ord = conn_param->initiator_depth;
2979         iw_param.ird = conn_param->responder_resources;
2980         iw_param.private_data = conn_param->private_data;
2981         iw_param.private_data_len = conn_param->private_data_len;
2982         if (id_priv->id.qp) {
2983                 iw_param.qpn = id_priv->qp_num;
2984         } else
2985                 iw_param.qpn = conn_param->qp_num;
2986
2987         return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2988 }
2989
2990 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2991                              enum ib_cm_sidr_status status, u32 qkey,
2992                              const void *private_data, int private_data_len)
2993 {
2994         struct ib_cm_sidr_rep_param rep;
2995         int ret;
2996
2997         memset(&rep, 0, sizeof rep);
2998         rep.status = status;
2999         if (status == IB_SIDR_SUCCESS) {
3000                 ret = cma_set_qkey(id_priv, qkey);
3001                 if (ret)
3002                         return ret;
3003                 rep.qp_num = id_priv->qp_num;
3004                 rep.qkey = id_priv->qkey;
3005         }
3006         rep.private_data = private_data;
3007         rep.private_data_len = private_data_len;
3008
3009         return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3010 }
3011
3012 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3013 {
3014         struct rdma_id_private *id_priv;
3015         int ret;
3016
3017         id_priv = container_of(id, struct rdma_id_private, id);
3018
3019         id_priv->owner = task_pid_nr(current);
3020
3021         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3022                 return -EINVAL;
3023
3024         if (!id->qp && conn_param) {
3025                 id_priv->qp_num = conn_param->qp_num;
3026                 id_priv->srq = conn_param->srq;
3027         }
3028
3029         switch (rdma_node_get_transport(id->device->node_type)) {
3030         case RDMA_TRANSPORT_IB:
3031                 if (id->qp_type == IB_QPT_UD) {
3032                         if (conn_param)
3033                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3034                                                         conn_param->qkey,
3035                                                         conn_param->private_data,
3036                                                         conn_param->private_data_len);
3037                         else
3038                                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3039                                                         0, NULL, 0);
3040                 } else {
3041                         if (conn_param)
3042                                 ret = cma_accept_ib(id_priv, conn_param);
3043                         else
3044                                 ret = cma_rep_recv(id_priv);
3045                 }
3046                 break;
3047         case RDMA_TRANSPORT_IWARP:
3048                 ret = cma_accept_iw(id_priv, conn_param);
3049                 break;
3050         default:
3051                 ret = -ENOSYS;
3052                 break;
3053         }
3054
3055         if (ret)
3056                 goto reject;
3057
3058         return 0;
3059 reject:
3060         cma_modify_qp_err(id_priv);
3061         rdma_reject(id, NULL, 0);
3062         return ret;
3063 }
3064 EXPORT_SYMBOL(rdma_accept);
3065
3066 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3067 {
3068         struct rdma_id_private *id_priv;
3069         int ret;
3070
3071         id_priv = container_of(id, struct rdma_id_private, id);
3072         if (!id_priv->cm_id.ib)
3073                 return -EINVAL;
3074
3075         switch (id->device->node_type) {
3076         case RDMA_NODE_IB_CA:
3077                 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3078                 break;
3079         default:
3080                 ret = 0;
3081                 break;
3082         }
3083         return ret;
3084 }
3085 EXPORT_SYMBOL(rdma_notify);
3086
3087 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3088                 u8 private_data_len)
3089 {
3090         struct rdma_id_private *id_priv;
3091         int ret;
3092
3093         id_priv = container_of(id, struct rdma_id_private, id);
3094         if (!id_priv->cm_id.ib)
3095                 return -EINVAL;
3096
3097         switch (rdma_node_get_transport(id->device->node_type)) {
3098         case RDMA_TRANSPORT_IB:
3099                 if (id->qp_type == IB_QPT_UD)
3100                         ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3101                                                 private_data, private_data_len);
3102                 else
3103                         ret = ib_send_cm_rej(id_priv->cm_id.ib,
3104                                              IB_CM_REJ_CONSUMER_DEFINED, NULL,
3105                                              0, private_data, private_data_len);
3106                 break;
3107         case RDMA_TRANSPORT_IWARP:
3108                 ret = iw_cm_reject(id_priv->cm_id.iw,
3109                                    private_data, private_data_len);
3110                 break;
3111         default:
3112                 ret = -ENOSYS;
3113                 break;
3114         }
3115         return ret;
3116 }
3117 EXPORT_SYMBOL(rdma_reject);
3118
3119 int rdma_disconnect(struct rdma_cm_id *id)
3120 {
3121         struct rdma_id_private *id_priv;
3122         int ret;
3123
3124         id_priv = container_of(id, struct rdma_id_private, id);
3125         if (!id_priv->cm_id.ib)
3126                 return -EINVAL;
3127
3128         switch (rdma_node_get_transport(id->device->node_type)) {
3129         case RDMA_TRANSPORT_IB:
3130                 ret = cma_modify_qp_err(id_priv);
3131                 if (ret)
3132                         goto out;
3133                 /* Initiate or respond to a disconnect. */
3134                 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3135                         ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3136                 break;
3137         case RDMA_TRANSPORT_IWARP:
3138                 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3139                 break;
3140         default:
3141                 ret = -EINVAL;
3142                 break;
3143         }
3144 out:
3145         return ret;
3146 }
3147 EXPORT_SYMBOL(rdma_disconnect);
3148
3149 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3150 {
3151         struct rdma_id_private *id_priv;
3152         struct cma_multicast *mc = multicast->context;
3153         struct rdma_cm_event event;
3154         int ret;
3155
3156         id_priv = mc->id_priv;
3157         if (cma_disable_callback(id_priv, RDMA_CM_ADDR_BOUND) &&
3158             cma_disable_callback(id_priv, RDMA_CM_ADDR_RESOLVED))
3159                 return 0;
3160
3161         if (!status)
3162                 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3163         mutex_lock(&id_priv->qp_mutex);
3164         if (!status && id_priv->id.qp)
3165                 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3166                                          be16_to_cpu(multicast->rec.mlid));
3167         mutex_unlock(&id_priv->qp_mutex);
3168
3169         memset(&event, 0, sizeof event);
3170         event.status = status;
3171         event.param.ud.private_data = mc->context;
3172         if (!status) {
3173                 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3174                 ib_init_ah_from_mcmember(id_priv->id.device,
3175                                          id_priv->id.port_num, &multicast->rec,
3176                                          &event.param.ud.ah_attr);
3177                 event.param.ud.qp_num = 0xFFFFFF;
3178                 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3179         } else
3180                 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3181
3182         ret = id_priv->id.event_handler(&id_priv->id, &event);
3183         if (ret) {
3184                 cma_exch(id_priv, RDMA_CM_DESTROYING);
3185                 mutex_unlock(&id_priv->handler_mutex);
3186                 rdma_destroy_id(&id_priv->id);
3187                 return 0;
3188         }
3189
3190         mutex_unlock(&id_priv->handler_mutex);
3191         return 0;
3192 }
3193
3194 static void cma_set_mgid(struct rdma_id_private *id_priv,
3195                          struct sockaddr *addr, union ib_gid *mgid)
3196 {
3197         unsigned char mc_map[MAX_ADDR_LEN];
3198         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3199         struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3200         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3201
3202         if (cma_any_addr(addr)) {
3203                 memset(mgid, 0, sizeof *mgid);
3204         } else if ((addr->sa_family == AF_INET6) &&
3205                    ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3206                                                                  0xFF10A01B)) {
3207                 /* IPv6 address is an SA assigned MGID. */
3208                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3209         } else if (addr->sa_family == AF_IB) {
3210                 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3211         } else if ((addr->sa_family == AF_INET6)) {
3212                 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3213                 if (id_priv->id.ps == RDMA_PS_UDP)
3214                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3215                 *mgid = *(union ib_gid *) (mc_map + 4);
3216         } else {
3217                 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3218                 if (id_priv->id.ps == RDMA_PS_UDP)
3219                         mc_map[7] = 0x01;       /* Use RDMA CM signature */
3220                 *mgid = *(union ib_gid *) (mc_map + 4);
3221         }
3222 }
3223
3224 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3225                                  struct cma_multicast *mc)
3226 {
3227         struct ib_sa_mcmember_rec rec;
3228         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3229         ib_sa_comp_mask comp_mask;
3230         int ret;
3231
3232         ib_addr_get_mgid(dev_addr, &rec.mgid);
3233         ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3234                                      &rec.mgid, &rec);
3235         if (ret)
3236                 return ret;
3237
3238         ret = cma_set_qkey(id_priv, 0);
3239         if (ret)
3240                 return ret;
3241
3242         cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3243         rec.qkey = cpu_to_be32(id_priv->qkey);
3244         rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3245         rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3246         rec.join_state = 1;
3247
3248         comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3249                     IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3250                     IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3251                     IB_SA_MCMEMBER_REC_FLOW_LABEL |
3252                     IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3253
3254         if (id_priv->id.ps == RDMA_PS_IPOIB)
3255                 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3256                              IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3257                              IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3258                              IB_SA_MCMEMBER_REC_MTU |
3259                              IB_SA_MCMEMBER_REC_HOP_LIMIT;
3260
3261         mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3262                                                 id_priv->id.port_num, &rec,
3263                                                 comp_mask, GFP_KERNEL,
3264                                                 cma_ib_mc_handler, mc);
3265         return PTR_ERR_OR_ZERO(mc->multicast.ib);
3266 }
3267
3268 static void iboe_mcast_work_handler(struct work_struct *work)
3269 {
3270         struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3271         struct cma_multicast *mc = mw->mc;
3272         struct ib_sa_multicast *m = mc->multicast.ib;
3273
3274         mc->multicast.ib->context = mc;
3275         cma_ib_mc_handler(0, m);
3276         kref_put(&mc->mcref, release_mc);
3277         kfree(mw);
3278 }
3279
3280 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3281 {
3282         struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3283         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3284
3285         if (cma_any_addr(addr)) {
3286                 memset(mgid, 0, sizeof *mgid);
3287         } else if (addr->sa_family == AF_INET6) {
3288                 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3289         } else {
3290                 mgid->raw[0] = 0xff;
3291                 mgid->raw[1] = 0x0e;
3292                 mgid->raw[2] = 0;
3293                 mgid->raw[3] = 0;
3294                 mgid->raw[4] = 0;
3295                 mgid->raw[5] = 0;
3296                 mgid->raw[6] = 0;
3297                 mgid->raw[7] = 0;
3298                 mgid->raw[8] = 0;
3299                 mgid->raw[9] = 0;
3300                 mgid->raw[10] = 0xff;
3301                 mgid->raw[11] = 0xff;
3302                 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3303         }
3304 }
3305
3306 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3307                                    struct cma_multicast *mc)
3308 {
3309         struct iboe_mcast_work *work;
3310         struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3311         int err;
3312         struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3313         struct net_device *ndev = NULL;
3314
3315         if (cma_zero_addr((struct sockaddr *)&mc->addr))
3316                 return -EINVAL;
3317
3318         work = kzalloc(sizeof *work, GFP_KERNEL);
3319         if (!work)
3320                 return -ENOMEM;
3321
3322         mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3323         if (!mc->multicast.ib) {
3324                 err = -ENOMEM;
3325                 goto out1;
3326         }
3327
3328         cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3329
3330         mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3331         if (id_priv->id.ps == RDMA_PS_UDP)
3332                 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3333
3334         if (dev_addr->bound_dev_if)
3335                 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3336         if (!ndev) {
3337                 err = -ENODEV;
3338                 goto out2;
3339         }
3340         mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3341         mc->multicast.ib->rec.hop_limit = 1;
3342         mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3343         dev_put(ndev);
3344         if (!mc->multicast.ib->rec.mtu) {
3345                 err = -EINVAL;
3346                 goto out2;
3347         }
3348         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3349                     &mc->multicast.ib->rec.port_gid);
3350         work->id = id_priv;
3351         work->mc = mc;
3352         INIT_WORK(&work->work, iboe_mcast_work_handler);
3353         kref_get(&mc->mcref);
3354         queue_work(cma_wq, &work->work);
3355
3356         return 0;
3357
3358 out2:
3359         kfree(mc->multicast.ib);
3360 out1:
3361         kfree(work);
3362         return err;
3363 }
3364
3365 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3366                         void *context)
3367 {
3368         struct rdma_id_private *id_priv;
3369         struct cma_multicast *mc;
3370         int ret;
3371
3372         id_priv = container_of(id, struct rdma_id_private, id);
3373         if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3374             !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3375                 return -EINVAL;
3376
3377         mc = kmalloc(sizeof *mc, GFP_KERNEL);
3378         if (!mc)
3379                 return -ENOMEM;
3380
3381         memcpy(&mc->addr, addr, rdma_addr_size(addr));
3382         mc->context = context;
3383         mc->id_priv = id_priv;
3384
3385         spin_lock(&id_priv->lock);
3386         list_add(&mc->list, &id_priv->mc_list);
3387         spin_unlock(&id_priv->lock);
3388
3389         switch (rdma_node_get_transport(id->device->node_type)) {
3390         case RDMA_TRANSPORT_IB:
3391                 switch (rdma_port_get_link_layer(id->device, id->port_num)) {
3392                 case IB_LINK_LAYER_INFINIBAND:
3393                         ret = cma_join_ib_multicast(id_priv, mc);
3394                         break;
3395                 case IB_LINK_LAYER_ETHERNET:
3396                         kref_init(&mc->mcref);
3397                         ret = cma_iboe_join_multicast(id_priv, mc);
3398                         break;
3399                 default:
3400                         ret = -EINVAL;
3401                 }
3402                 break;
3403         default:
3404                 ret = -ENOSYS;
3405                 break;
3406         }
3407
3408         if (ret) {
3409                 spin_lock_irq(&id_priv->lock);
3410                 list_del(&mc->list);
3411                 spin_unlock_irq(&id_priv->lock);
3412                 kfree(mc);
3413         }
3414         return ret;
3415 }
3416 EXPORT_SYMBOL(rdma_join_multicast);
3417
3418 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3419 {
3420         struct rdma_id_private *id_priv;
3421         struct cma_multicast *mc;
3422
3423         id_priv = container_of(id, struct rdma_id_private, id);
3424         spin_lock_irq(&id_priv->lock);
3425         list_for_each_entry(mc, &id_priv->mc_list, list) {
3426                 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
3427                         list_del(&mc->list);
3428                         spin_unlock_irq(&id_priv->lock);
3429
3430                         if (id->qp)
3431                                 ib_detach_mcast(id->qp,
3432                                                 &mc->multicast.ib->rec.mgid,
3433                                                 be16_to_cpu(mc->multicast.ib->rec.mlid));
3434                         if (rdma_node_get_transport(id_priv->cma_dev->device->node_type) == RDMA_TRANSPORT_IB) {
3435                                 switch (rdma_port_get_link_layer(id->device, id->port_num)) {
3436                                 case IB_LINK_LAYER_INFINIBAND:
3437                                         ib_sa_free_multicast(mc->multicast.ib);
3438                                         kfree(mc);
3439                                         break;
3440                                 case IB_LINK_LAYER_ETHERNET:
3441                                         kref_put(&mc->mcref, release_mc);
3442                                         break;
3443                                 default:
3444                                         break;
3445                                 }
3446                         }
3447                         return;
3448                 }
3449         }
3450         spin_unlock_irq(&id_priv->lock);
3451 }
3452 EXPORT_SYMBOL(rdma_leave_multicast);
3453
3454 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
3455 {
3456         struct rdma_dev_addr *dev_addr;
3457         struct cma_ndev_work *work;
3458
3459         dev_addr = &id_priv->id.route.addr.dev_addr;
3460
3461         if ((dev_addr->bound_dev_if == ndev->ifindex) &&
3462             memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
3463                 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
3464                        ndev->name, &id_priv->id);
3465                 work = kzalloc(sizeof *work, GFP_KERNEL);
3466                 if (!work)
3467                         return -ENOMEM;
3468
3469                 INIT_WORK(&work->work, cma_ndev_work_handler);
3470                 work->id = id_priv;
3471                 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
3472                 atomic_inc(&id_priv->refcount);
3473                 queue_work(cma_wq, &work->work);
3474         }
3475
3476         return 0;
3477 }
3478
3479 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
3480                                void *ptr)
3481 {
3482         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
3483         struct cma_device *cma_dev;
3484         struct rdma_id_private *id_priv;
3485         int ret = NOTIFY_DONE;
3486
3487         if (dev_net(ndev) != &init_net)
3488                 return NOTIFY_DONE;
3489
3490         if (event != NETDEV_BONDING_FAILOVER)
3491                 return NOTIFY_DONE;
3492
3493         if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
3494                 return NOTIFY_DONE;
3495
3496         mutex_lock(&lock);
3497         list_for_each_entry(cma_dev, &dev_list, list)
3498                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3499                         ret = cma_netdev_change(ndev, id_priv);
3500                         if (ret)
3501                                 goto out;
3502                 }
3503
3504 out:
3505         mutex_unlock(&lock);
3506         return ret;
3507 }
3508
3509 static struct notifier_block cma_nb = {
3510         .notifier_call = cma_netdev_callback
3511 };
3512
3513 static void cma_add_one(struct ib_device *device)
3514 {
3515         struct cma_device *cma_dev;
3516         struct rdma_id_private *id_priv;
3517
3518         cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
3519         if (!cma_dev)
3520                 return;
3521
3522         cma_dev->device = device;
3523
3524         init_completion(&cma_dev->comp);
3525         atomic_set(&cma_dev->refcount, 1);
3526         INIT_LIST_HEAD(&cma_dev->id_list);
3527         ib_set_client_data(device, &cma_client, cma_dev);
3528
3529         mutex_lock(&lock);
3530         list_add_tail(&cma_dev->list, &dev_list);
3531         list_for_each_entry(id_priv, &listen_any_list, list)
3532                 cma_listen_on_dev(id_priv, cma_dev);
3533         mutex_unlock(&lock);
3534 }
3535
3536 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
3537 {
3538         struct rdma_cm_event event;
3539         enum rdma_cm_state state;
3540         int ret = 0;
3541
3542         /* Record that we want to remove the device */
3543         state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
3544         if (state == RDMA_CM_DESTROYING)
3545                 return 0;
3546
3547         cma_cancel_operation(id_priv, state);
3548         mutex_lock(&id_priv->handler_mutex);
3549
3550         /* Check for destruction from another callback. */
3551         if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
3552                 goto out;
3553
3554         memset(&event, 0, sizeof event);
3555         event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
3556         ret = id_priv->id.event_handler(&id_priv->id, &event);
3557 out:
3558         mutex_unlock(&id_priv->handler_mutex);
3559         return ret;
3560 }
3561
3562 static void cma_process_remove(struct cma_device *cma_dev)
3563 {
3564         struct rdma_id_private *id_priv;
3565         int ret;
3566
3567         mutex_lock(&lock);
3568         while (!list_empty(&cma_dev->id_list)) {
3569                 id_priv = list_entry(cma_dev->id_list.next,
3570                                      struct rdma_id_private, list);
3571
3572                 list_del(&id_priv->listen_list);
3573                 list_del_init(&id_priv->list);
3574                 atomic_inc(&id_priv->refcount);
3575                 mutex_unlock(&lock);
3576
3577                 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
3578                 cma_deref_id(id_priv);
3579                 if (ret)
3580                         rdma_destroy_id(&id_priv->id);
3581
3582                 mutex_lock(&lock);
3583         }
3584         mutex_unlock(&lock);
3585
3586         cma_deref_dev(cma_dev);
3587         wait_for_completion(&cma_dev->comp);
3588 }
3589
3590 static void cma_remove_one(struct ib_device *device)
3591 {
3592         struct cma_device *cma_dev;
3593
3594         cma_dev = ib_get_client_data(device, &cma_client);
3595         if (!cma_dev)
3596                 return;
3597
3598         mutex_lock(&lock);
3599         list_del(&cma_dev->list);
3600         mutex_unlock(&lock);
3601
3602         cma_process_remove(cma_dev);
3603         kfree(cma_dev);
3604 }
3605
3606 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
3607 {
3608         struct nlmsghdr *nlh;
3609         struct rdma_cm_id_stats *id_stats;
3610         struct rdma_id_private *id_priv;
3611         struct rdma_cm_id *id = NULL;
3612         struct cma_device *cma_dev;
3613         int i_dev = 0, i_id = 0;
3614
3615         /*
3616          * We export all of the IDs as a sequence of messages.  Each
3617          * ID gets its own netlink message.
3618          */
3619         mutex_lock(&lock);
3620
3621         list_for_each_entry(cma_dev, &dev_list, list) {
3622                 if (i_dev < cb->args[0]) {
3623                         i_dev++;
3624                         continue;
3625                 }
3626
3627                 i_id = 0;
3628                 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3629                         if (i_id < cb->args[1]) {
3630                                 i_id++;
3631                                 continue;
3632                         }
3633
3634                         id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
3635                                                 sizeof *id_stats, RDMA_NL_RDMA_CM,
3636                                                 RDMA_NL_RDMA_CM_ID_STATS);
3637                         if (!id_stats)
3638                                 goto out;
3639
3640                         memset(id_stats, 0, sizeof *id_stats);
3641                         id = &id_priv->id;
3642                         id_stats->node_type = id->route.addr.dev_addr.dev_type;
3643                         id_stats->port_num = id->port_num;
3644                         id_stats->bound_dev_if =
3645                                 id->route.addr.dev_addr.bound_dev_if;
3646
3647                         if (ibnl_put_attr(skb, nlh,
3648                                           rdma_addr_size(cma_src_addr(id_priv)),
3649                                           cma_src_addr(id_priv),
3650                                           RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
3651                                 goto out;
3652                         if (ibnl_put_attr(skb, nlh,
3653                                           rdma_addr_size(cma_src_addr(id_priv)),
3654                                           cma_dst_addr(id_priv),
3655                                           RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
3656                                 goto out;
3657
3658                         id_stats->pid           = id_priv->owner;
3659                         id_stats->port_space    = id->ps;
3660                         id_stats->cm_state      = id_priv->state;
3661                         id_stats->qp_num        = id_priv->qp_num;
3662                         id_stats->qp_type       = id->qp_type;
3663
3664                         i_id++;
3665                 }
3666
3667                 cb->args[1] = 0;
3668                 i_dev++;
3669         }
3670
3671 out:
3672         mutex_unlock(&lock);
3673         cb->args[0] = i_dev;
3674         cb->args[1] = i_id;
3675
3676         return skb->len;
3677 }
3678
3679 static const struct ibnl_client_cbs cma_cb_table[] = {
3680         [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
3681                                        .module = THIS_MODULE },
3682 };
3683
3684 static int __init cma_init(void)
3685 {
3686         int ret;
3687
3688         cma_wq = create_singlethread_workqueue("rdma_cm");
3689         if (!cma_wq)
3690                 return -ENOMEM;
3691
3692         ib_sa_register_client(&sa_client);
3693         rdma_addr_register_client(&addr_client);
3694         register_netdevice_notifier(&cma_nb);
3695
3696         ret = ib_register_client(&cma_client);
3697         if (ret)
3698                 goto err;
3699
3700         if (ibnl_add_client(RDMA_NL_RDMA_CM, RDMA_NL_RDMA_CM_NUM_OPS, cma_cb_table))
3701                 printk(KERN_WARNING "RDMA CMA: failed to add netlink callback\n");
3702
3703         return 0;
3704
3705 err:
3706         unregister_netdevice_notifier(&cma_nb);
3707         rdma_addr_unregister_client(&addr_client);
3708         ib_sa_unregister_client(&sa_client);
3709         destroy_workqueue(cma_wq);
3710         return ret;
3711 }
3712
3713 static void __exit cma_cleanup(void)
3714 {
3715         ibnl_remove_client(RDMA_NL_RDMA_CM);
3716         ib_unregister_client(&cma_client);
3717         unregister_netdevice_notifier(&cma_nb);
3718         rdma_addr_unregister_client(&addr_client);
3719         ib_sa_unregister_client(&sa_client);
3720         destroy_workqueue(cma_wq);
3721         idr_destroy(&tcp_ps);
3722         idr_destroy(&udp_ps);
3723         idr_destroy(&ipoib_ps);
3724         idr_destroy(&ib_ps);
3725 }
3726
3727 module_init(cma_init);
3728 module_exit(cma_cleanup);